E90Post
 


N54Tuning.com
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Whats everyones view on CP-E Catless Downpipes.



Reply
 
Thread Tools Search this Thread
      10-13-2011, 01:29 PM   #1
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Whats everyones view on CP-E Catless Downpipes.

Was just looking for some owners feedback on quality, and fit of these DP's.

http://www.cp-e.com/products/bmw-335...5i-3-downpipes

I really like the belmouth cast 3" by the turbo even tho it then goes to a 2.5".
But then again i never was a believer that making a DP taper earlier or later to 2.5" helped anything, as long as the first part of the DP is 3" to collect the exhaust gases coming out the turbo directly. Since ALL DP's taper to 2.5"anyways.
Its like blowing into a straw, will compressing with ur fingers closer to the top of the straw rather than closer by the bottom, make a difference of how much air is released

Last edited by 5soko; 10-13-2011 at 01:45 PM.
Appreciate 0
      10-13-2011, 02:38 PM   #2
Zasquatch
Captain
Zasquatch's Avatar
United_States
15
Rep
627
Posts

Drives: '07 BMW 335i
Join Date: Sep 2010
Location: CT

iTrader: (15)

Garage List
2007 BMW 335i  [0.00]
I've got these and absolutly love them. No complaints at all. I had the same viewpoint as you... in my opinion the cast bellmouth made up for the fact that they tapered sooner. The fact that the piping is 2.5" also makes installation alot easier since you have more room to work with. The welds are beautiful, the castings are fantastic, and fitament is spot-on.
Appreciate 0
      10-13-2011, 02:57 PM   #3
PlutoniumTans
Lieutenant
United_States
11
Rep
575
Posts

Drives: 335i
Join Date: Jul 2011
Location: Brooklyn,NY

iTrader: (2)

Quote:
Originally Posted by 5soko335i View Post
Was just looking for some owners feedback on quality, and fit of these DP's.

http://www.cp-e.com/products/bmw-335...5i-3-downpipes

I really like the belmouth cast 3" by the turbo even tho it then goes to a 2.5".
But then again i never was a believer that making a DP taper earlier or later to 2.5" helped anything, as long as the first part of the DP is 3" to collect the exhaust gases coming out the turbo directly. Since ALL DP's taper to 2.5"anyways.
Its like blowing into a straw, will compressing with ur fingers closer to the top of the straw rather than closer by the bottom, make a difference of how much air is released

Lumi you Serbian speed racer , if you don't mind spending around 600 already better for these http://www.europeanautosource.com/pr...s-n54-variants i'm sure there are vendors who will go bellow the price, it's full 3 inch, fits like a glove, and will have a better resale value
Appreciate 1
      10-13-2011, 03:09 PM   #4
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Quote:
Originally Posted by Zasquatch View Post
I've got these and absolutly love them. No complaints at all. I had the same viewpoint as you... in my opinion the cast bellmouth made up for the fact that they tapered sooner. The fact that the piping is 2.5" also makes installation alot easier since you have more room to work with. The welds are beautiful, the castings are fantastic, and fitament is spot-on.
Thanks alot for the input! Much appreciated.

Quote:
Originally Posted by PlutoniumTans View Post
Lumi you Serbian speed racer , if you don't mind spending around 600 already better for these http://www.europeanautosource.com/pr...s-n54-variants i'm sure there are vendors who will go bellow the price, it's full 3 inch, fits like a glove, and will have a better resale value
HAHA thanks Mike this exactly was looking for after researching everything else. still wanna hear more about the CP-E from the owners. The MS looks exactly like the AR and AA's, all taper right before the flange to 2.5 and all are 3.0's.. the MS and AA's are def a great value for full 3" Dp's
Appreciate 0
      10-13-2011, 03:14 PM   #5
PlutoniumTans
Lieutenant
United_States
11
Rep
575
Posts

Drives: 335i
Join Date: Jul 2011
Location: Brooklyn,NY

iTrader: (2)

Quote:
Originally Posted by 5soko335i View Post
Thanks alot for the input! Much appreciated.



HAHA thanks Mike this exactly was looking for after researching everything else. still wanna hear more about the CP-E from the owners. The MS looks exactly like the AR and AA's, all taper right before the flange to 2.5 and all are 3.0's.. the MS and AA's are def a great value for full 3" Dp's
I think aa don't look anywhere near as good as MS, the curves on MS are nice and smooth, the welds are great, and I heard from installer shops the fit better too.
Appreciate 0
      10-13-2011, 03:36 PM   #6
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Yea i have been hearing some people are having install trouble with the AA's too..
Appreciate 0
      10-13-2011, 03:56 PM   #7
tscdennab
Banned
106
Rep
1,811
Posts

Drives: BMW 335i
Join Date: Oct 2010
Location: Europe

iTrader: (0)

Garage List
2008 BMW  [3.12]
If you will spend the money on downpipes, why not get 3" and settle for 2.5" for even more money ? You may leave power on the table with 2.5". And why spend the money and not maximize your gains ? Macht Schnells are like $150 cheaper, full 3" and fit perfectly.
Appreciate 0
      10-13-2011, 03:57 PM   #8
Jeff@TopGearSolutions
BimmerPost Supporting Vendor
Jeff@TopGearSolutions's Avatar
United_States
1606
Rep
40,598
Posts


Drives: C6 Z06, 09 335i, 10 335xi
Join Date: Dec 2008
Location: www.TopGearSolutions.com

iTrader: (36)

I think the CP-E, MS, and AA are all great DP's. Pick your poison!
__________________
|Add to Cart Discounts & Loyalty Rewards||Evolution Racewerks||Active Autowerke||ETS| |Burger Tuning| |Fabspeed| |Mishimoto||VRSF| |AWE| |Wagner|

|HPB 240W H8 Angel Eyes $99 | |VTT| |KW| |Spec| |ST Coilovers| |Koni| |Bilstein| |Borla| |MFactory| |AFE| |Shifteck| |Injen|Coding / PPK / Alpina
Appreciate 0
      10-13-2011, 04:06 PM   #9
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Quote:
Originally Posted by tscdennab View Post
If you will spend the money on downpipes, why not get 3" and settle for 2.5" for even more money ? You may leave power on the table with 2.5". And why spend the money and not maximize your gains ? Macht Schnells are like $150 cheaper, full 3" and fit perfectly.
At the moment Mike and Terry are selling the CPE's for 570.. but i mean for me, im not fully convinced that tapering earlier within the DP to 2.5 will make less power than a DP that tapers later in the DP to 2.5, as long as there 3" piping by the exiting of the Turbine gases by the top of the DP im pretty comfortable with that.. JMHO but i love to hear different views.
If it was a full 2.5 DP, then i might not be very comfortable.

Last edited by 5soko; 10-13-2011 at 04:12 PM.
Appreciate 0
      10-13-2011, 04:15 PM   #10
PlutoniumTans
Lieutenant
United_States
11
Rep
575
Posts

Drives: 335i
Join Date: Jul 2011
Location: Brooklyn,NY

iTrader: (2)

Quote:
Originally Posted by 5soko335i View Post
At the moment Mike and Terry are selling the CPE's for 570.. but i mean for me, im not fully convinced that tapering earlier within the DP to 2.5 will make less power than a DP that tapers later in the DP to 2.5, as long as there 3" piping by the exiting of the Turbine gases by the top of the DP im pretty comfortable with that.. JMHO but i love to hear different views.
If it was a full 2.5 DP, then i might not be very comfortable.
There's a reason why people go up in size in piping right ? so if the beginning is 3 and tapering to 1 inch is same thing also ? More flow , better for turbo cars!
Appreciate 0
      10-13-2011, 04:36 PM   #11
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Quote:
Originally Posted by PlutoniumTans View Post
There's a reason why people go up in size in piping right ? so if the beginning is 3 and tapering to 1 inch is same thing also ? More flow , better for turbo cars!
pretty much would be the same, if the rest of the catback is 1 inch...

Think of it as the exmaple i gave before, if u blow into a straw (no homo) and compress it a lil with ur finger at the top of the straw compared to if u are compressing it by the bottom of the straw, will the amount of air coming out the straw differ? einstein status hahah or i might be over thinking this.
Appreciate 0
      10-13-2011, 05:15 PM   #12
HomeRun217
Private First Class
3
Rep
172
Posts

Drives: 2010 135i, 2015 Tundra
Join Date: Dec 2008
Location: Denver, CO

iTrader: (1)

As long as the outlet is 2.5", it doesn't matter if it's a full 3" DP or if its a 3" bellmouth tapering to 2.5"... It's just slick marketing lingo to make you buy their product.
__________________
2015 Toyota Tundra Crewmax TRD
2010 BMW 135i - Titanium Silver - Procede v3/ETS 5" IC/AR Catless DP/N55mid/BMW Performance Exhaust/Ohlins DFV/M3 Full Suspension and Bushings/APEX ARC8/BMS OCC/VRSF Turbo Inlets & CP//Wavetrack LSD coming soon
Appreciate 0
      10-13-2011, 07:03 PM   #13
Topless///M
Private First Class
7
Rep
193
Posts

Drives: e92 335i 6mt, 94 probe gt
Join Date: Feb 2007
Location: Jersey

iTrader: (0)

One plus for the CP-Es is they seem thicker, a little more insulated like stock.

Most probably won't care, but when I had my ARs installed, I did hear more exhaust flow noise through the firewall and footwell area (not rubbing or leaks, but airflow noise) probably because they're not as thick and insulated as the stock ones. Some will probably think I'm crazy, but it's the same noise you hear when you put aftermarket headers on a car with thinwall primaries coming from a thick cast iron exhaust manifold. Wasn't that noticeable, but you could tell the difference. I didn't care much, but it's worth noting and my brother knew what I meant.

CP-Es seem to be made of thicker material....at least I know the cast belmouth is, not sure on the pipe.

Last edited by Topless///M; 10-13-2011 at 07:08 PM.
Appreciate 0
      10-14-2011, 01:04 AM   #14
5soko
Brigadier General
5soko's Avatar
131
Rep
4,272
Posts

Drives: M5
Join Date: Aug 2007
Location: Brooklyn, NY

iTrader: (4)

Quote:
Originally Posted by HomeRun217 View Post
As long as the outlet is 2.5", it doesn't matter if it's a full 3" DP or if its a 3" bellmouth tapering to 2.5"... It's just slick marketing lingo to make you buy their product.
Yea i always thought the same honestly. Even tho evberyone will refer to Mr.5 dyno comparison of 2.5 vs 3inch dp's, i dont really see how but i have yet to see anymore data.

Quote:
Originally Posted by Topless///M View Post
One plus for the CP-Es is they seem thicker, a little more insulated like stock.

Most probably won't care, but when I had my ARs installed, I did hear more exhaust flow noise through the firewall and footwell area (not rubbing or leaks, but airflow noise) probably because they're not as thick and insulated as the stock ones. Some will probably think I'm crazy, but it's the same noise you hear when you put aftermarket headers on a car with thinwall primaries coming from a thick cast iron exhaust manifold. Wasn't that noticeable, but you could tell the difference. I didn't care much, but it's worth noting and my brother knew what I meant.

CP-Es seem to be made of thicker material....at least I know the cast belmouth is, not sure on the pipe.
Interesting, thanks.
Appreciate 0
      10-14-2011, 08:36 AM   #15
Zasquatch
Captain
Zasquatch's Avatar
United_States
15
Rep
627
Posts

Drives: '07 BMW 335i
Join Date: Sep 2010
Location: CT

iTrader: (15)

Garage List
2007 BMW 335i  [0.00]
Quote:
Originally Posted by 5soko335i View Post
Yea i always thought the same honestly. Even tho evberyone will refer to Mr.5 dyno comparison of 2.5 vs 3inch dp's, i dont really see how but i have yet to see anymore data.
Not to mention the amount of R&D cp-e puts into their products is incredible. I got their FMIC after reading their white paper detailing their design and testing and the balance between dP and dT. I highly doubt they just chose their downpipe design willy nilly and ignored the fact that competitors used longer sections of 3" piping. I gaurantee those bellmouths are CAD modeled and flow tested/optimized...
Appreciate 0
      10-14-2011, 10:21 AM   #16
ar design
ar design's Avatar
United_States
103
Rep
4,408
Posts

Drives: 04 M3
Join Date: Jan 2008
Location: Denver, CO

iTrader: (9)

Send a message via AIM to ar design
Quote:
Originally Posted by Topless///M View Post
One plus for the CP-Es is they seem thicker, a little more insulated like stock.

Most probably won't care, but when I had my ARs installed, I did hear more exhaust flow noise through the firewall and footwell area (not rubbing or leaks, but airflow noise) probably because they're not as thick and insulated as the stock ones. Some will probably think I'm crazy, but it's the same noise you hear when you put aftermarket headers on a car with thinwall primaries coming from a thick cast iron exhaust manifold. Wasn't that noticeable, but you could tell the difference. I didn't care much, but it's worth noting and my brother knew what I meant.

CP-Es seem to be made of thicker material....at least I know the cast belmouth is, not sure on the pipe.
We use .065 wall tubing, same as cp-e.
__________________
-Critter
Appreciate 0
      11-03-2011, 04:33 AM   #17
geterdone
Private First Class
United_States
2
Rep
144
Posts

Drives: 2007 335i
Join Date: Mar 2011
Location: Yukon, Oklahoma

iTrader: (1)

Essentially if the DPs have 3" bellmouths and taper at least 1/3rd of the DP's length and are well designed, i.e. bends, then essentially a 3.0" to 2.5" would perform better based on physical flow modeling; since the rest of the exhaust is 2.5". I wish I could draw this out, but bigger isn't always better in some scenarios. Hence this is why I am probably going to go with the CPE's over the RLand's, since the RLand's are 2.5 all away down. Also please don't show me Mr.5's dyno results or thread, there is a huge difference when it comes down to having 3" bellmouths; in which case were not used on that test. Thanks
Appreciate 0
      04-10-2012, 05:51 PM   #18
E92ML
Captain
E92ML's Avatar
United_States
16
Rep
886
Posts

Drives: E92 2008 335xi Coupe
Join Date: May 2011
Location: Bellevue, WA

iTrader: (0)

How many xi guys are using CP-E downpipes?
__________________

Performance: JB4 ECU, CP-E DP's, WW BMS Meth Kit, AR meth elbow, BMS DCI, AFE Intake Scoops,
Exterior: Enkruez 19" H8R, H&R Spacers, Aero Lip, Tint, ACS Roof Spoiler, HID AE's, HID Fogs, Black Grills, Sport Pedals
Appreciate 0
      04-10-2012, 06:22 PM   #19
TOS_335i
bs_335i
TOS_335i's Avatar
United_States
1
Rep
79
Posts

Drives: 2009 335i
Join Date: Apr 2007
Location: Shavertown, PA

iTrader: (1)

Garage List
2009 BMW 335i  [0.00]
I'm in the process of installing my new CP-E dps right now! They are really nice pieces. Clean welds, and except for the bellmouth, they are a single piece. Can't really beat that for flow... I can't comment on the fitment, because I haven't gotten that far yet... I guess I'll find out soon enough.

BTW... I'm i not xi...
__________________
Cobb Stage 2+FMIC | CP-e DPs | CP-e DCI | ETS 5" FMIC
Appreciate 0
      04-10-2012, 07:35 PM   #20
Rotary Rasp
Lieutenant Colonel
Rotary Rasp's Avatar
126
Rep
1,833
Posts

Drives: 2009 E92 335i 6MT
Join Date: Aug 2008
Location: SoCal - Torrance

iTrader: (6)

I have VRSF but I have the admit, I think the CP-E are probably the best design. I also think the price is reasonable given the casting of the bell housing and one piece design.
__________________
Appreciate 0
      04-10-2012, 07:36 PM   #21
BMWeber
Major
19
Rep
1,329
Posts

Drives: 08 135i
Join Date: Sep 2007
Location: Amesbury, MA

iTrader: (5)

Ive tried a few different DPs and CP-E are my favorite great fit easy installation and they are very rugged.
Appreciate 0
      04-10-2012, 09:21 PM   #22
klipseracer
Banned
United_States
116
Rep
3,012
Posts

Drives: 2007 E90 335i, 05 E46 330i
Join Date: Aug 2009
Location: Arizona

iTrader: (27)

Garage List
2007 335i  [0.00]
2005 330i  [0.00]
Send a message via MSN to klipseracer
Quote:
Originally Posted by 5soko335i View Post
Since ALL DP's taper to 2.5"anyways.
Not true. 3" all the way through the midpipes, vbands both ends of the DP. No taper until the end of the midpipe, and only because it mated to stock exhaust.

Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 05:41 AM.




e90post
e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST