Modify OEM exhaust to sound like PE exhaust

GODDSPD · 09-30-2015, 02:48 PM

Quote:

Originally Posted by nitehawk

PE mod peeps, I would like to understand why nobody with downpipes seems to claim no rasp. In contrast, most with an actual PE report a lot of rasp with downpipes. Is there anyone out there with the PE mod that can confirm it is too raspy with downpipes? I'm wondering how much of it has to do with leaving the packing in the mufflers as that seems to be the only difference...

I have an n54 with PE mod and downpipes, and I can tell you that there is a correlation between boost and rasp, which might be contributing to the varying info.

When I'm running pump gas at 12-15 psi I get some "rasp" at the very top of the rpm range (which I think sounds awesome, almost like an e46 m3). With e85 at 18-20psi, no rasp. At stock boost, I hear even more rasp. It's just a matter of the turbos muffling the exhaust.

To test this, set DWP at 0 and keep the car in 1st gear, then slowly accelerate up to redline, staying out of boost. From about 5-6k it is louder than a straight piped civic and rasps like crazy.

PNWN54 · 09-30-2015, 05:35 PM

Quote:

Originally Posted by GODDSPD

I have an n54 with PE mod and downpipes, and I can tell you that there is a correlation between boost and rasp, which might be contributing to the varying info.

When I'm running pump gas at 12-15 psi I get some "rasp" at the very top of the rpm range (which I think sounds awesome, almost like an e46 m3). With e85 at 18-20psi, no rasp. At stock boost, I hear even more rasp. It's just a matter of the turbos muffling the exhaust.

To test this, set DWP at 0 and keep the car in 1st gear, then slowly accelerate up to redline, staying out of boost. From about 5-6k it is louder than a straight piped civic and rasps like crazy.

Funny, I could actually relate to this; sometime ago when I had my old 335i with OEM PE, my vaccum lines tore and weren't holding any boost. After that I noticed that my exhaust got a lot louder and started to get a nice rasp at the top end. The difference was quite noticeable and it almost had me thinking I got catless downpipes installed overnight for free but without any boost. Lol 😂
Got the vaccum lines replaced and the exhaust was back to quite and subdued.

JasW · 09-30-2015, 05:45 PM

Quote:

Originally Posted by Conti.

Quote:

Originally Posted by nitehawk

PE mod peeps, I would like to understand why nobody with downpipes seems to claim no rasp. In contrast, most with an actual PE report a lot of rasp with downpipes. Is there anyone out there with the PE mod that can confirm it is too raspy with downpipes? I'm wondering how much of it has to do with leaving the packing in the mufflers as that seems to be the only difference...

I think part of it has to do with some people having a n55 and with downpipes the pe mod on an n55 doesn't get nearly as raspy, if at all, as us n54 guys. I've heard it in person on an n55 and sounded amazing but seems like everything I hear with the n54 and downpipes is always raspy.

a lot of kids I guess are used to it and don't report it and think it's normal. some people report it, some have different resonators, and others don't drive in the higher rpms to notice it as much in the cabin to report.

just my .02 and food for thought

I have the sweet 335is exhaust, not that different from the PE, paired with ar downpipes, and an MT to boot, so I'm always winding out the lower gears in those higher RPMs. When I hit 5000 RPMs in first or second, the rasp or flabby duck call bladder sound or whatever you want call it gets super intense, not to mention if the top is down. It's a bit ricey for me and I may end up going the resonator route. I just don't want to get rid of all the good sounds.

nitehawk · 09-30-2015, 09:18 PM

Quote:

Originally Posted by Conti.

I think part of it has to do with some people having a n55 and with downpipes the pe mod on an n55 doesn't get nearly as raspy, if at all, as us n54 guys. I've heard it in person on an n55 and sounded amazing but seems like everything I hear with the n54 and downpipes is always raspy.

a lot of kids I guess are used to it and don't report it and think it's normal. some people report it, some have different resonators, and others don't drive in the higher rpms to notice it as much in the cabin to report.

just my .02 and food for thought

Good points...I think those with an E90 who leave their resonators in place would likely see little to no rasp. What is going to be your setup?

nitehawk · 09-30-2015, 09:24 PM

Quote:

Originally Posted by GODDSPD

I have an n54 with PE mod and downpipes, and I can tell you that there is a correlation between boost and rasp, which might be contributing to the varying info.

When I'm running pump gas at 12-15 psi I get some "rasp" at the very top of the rpm range (which I think sounds awesome, almost like an e46 m3). With e85 at 18-20psi, no rasp. At stock boost, I hear even more rasp. It's just a matter of the turbos muffling the exhaust.

To test this, set DWP at 0 and keep the car in 1st gear, then slowly accelerate up to redline, staying out of boost. From about 5-6k it is louder than a straight piped civic and rasps like crazy.

True, boost would definitely play a role. How are your mufflers modded exactly?

Conti. · 09-30-2015, 09:39 PM

Quote:

Originally Posted by nitehawk

Quote:

Originally Posted by Conti.

I think part of it has to do with some people having a n55 and with downpipes the pe mod on an n55 doesn't get nearly as raspy, if at all, as us n54 guys. I've heard it in person on an n55 and sounded amazing but seems like everything I hear with the n54 and downpipes is always raspy.

a lot of kids I guess are used to it and don't report it and think it's normal. some people report it, some have different resonators, and others don't drive in the higher rpms to notice it as much in the cabin to report.

just my .02 and food for thought

Good points...I think those with an E90 who leave their resonators in place would likely see little to no rasp. What is going to be your setup?

i had an extra muffler I started to mod about a year ago and then never finished. I didn't have the correct type of welder available and just never went out and got it done. at this point I'm just waiting for the vrsf catback. unfortunately it's taken a lifetime to complete but i think it's one of the least raspy sounding options out there for the n54.

GODDSPD · 09-30-2015, 10:34 PM

Quote:

Originally Posted by nitehawk

True, boost would definitely play a role. How are your mufflers modded exactly?

The perforated straight pipes were replaced with solid pipe in both mufflers. Packaging was kept in and split 50/50 for each side.

Later on I threw on some 4 in double wall tips and it actually lessened the rasp a bit.

JasW · 10-01-2015, 05:16 AM

Quote:

Originally Posted by GODDSPD

I have an n54 with PE mod and downpipes, and I can tell you that there is a correlation between boost and rasp, which might be contributing to the varying info.

When I'm running pump gas at 12-15 psi I get some "rasp" at the very top of the rpm range (which I think sounds awesome, almost like an e46 m3). With e85 at 18-20psi, no rasp. At stock boost, I hear even more rasp. It's just a matter of the turbos muffling the exhaust.

To test this, set DWP at 0 and keep the car in 1st gear, then slowly accelerate up to redline, staying out of boost. From about 5-6k it is louder than a straight piped civic and rasps like crazy.

I've got an MT but this seems to jibe with my experience. I'm pushing 20 psi on E60 and while I get some rasp, it's nothing compared to just a simple friendly neighborhood wind-out acceleration through first and second without boost. Christ, that thing is loud. I don't know which is worse, the rasp or the Civic drone. Probably the drone, but AFAIK, there's nothing one can do to get rid of it. If anyone has any suggestions, I'm all ears.

MJ80. · 10-01-2015, 06:57 AM

Fucken love rasp want more of it.

b1mmr · 10-01-2015, 11:52 PM

Honestly if I knew I was going to cut all cats and mod the exhaust I probably would have left my resonator but hey it's a little late for that

PNWN54 · 10-06-2015, 10:53 AM

Got my downpipes installed and the exhaust purrs!!! A lot more aggressive exhaust note and the rpms are more pronounced. Cold starts are noticeably louder and 1st gear has a little bit of rasp around 5-6k but it's not the rasp that caught me off guard but the sudden volume increase, it's almost as if volume went from 5-10 real quick. Lol
Seems like 2nd and 3rd gear rasp is almost non apparent.

BeastMode335i · 10-06-2015, 01:47 PM

Quote:

Originally Posted by Rock&Roll

Got my downpipes installed and the exhaust purrs!!! A lot more aggressive exhaust note and the rpms are more pronounced. Cold starts are noticeably louder and 1st gear has a little bit of rasp around 5-6k but it's not the rasp that caught me off guard but the sudden volume increase, it's almost as if volume went from 5-10 real quick. Lol
Seems like 2nd and 3rd gear rasp is almost non apparent.

Wish I could find someone in South Florida to hook mine up..!! They're all "eco friendly" and shit.. smh...

PNWN54 · 10-06-2015, 02:13 PM

Quote:

Originally Posted by BeastMode335i

Wish I could find someone in South Florida to hook mine up..!! They're all "eco friendly" and shit.. smh...

Paid a cool forum member to get mine installed but it was an easy and simple install that I could've done at home with ramps if I knew better. If you're handy with tools, save yourself the money and do it at home. May take about 3-4 hours.

BeastMode335i · 10-06-2015, 02:38 PM

Quote:

Originally Posted by Rock&Roll

Paid a cool forum member to get mine installed but it was an easy and simple install that I could've done at home with ramps if I knew better. If you're handy with tools, save yourself the money and do it at home. May take about 3-4 hours.

He cut it open and welded in those straight pipes and everything..!?

PNWN54 · 10-06-2015, 03:56 PM

Quote:

Originally Posted by BeastMode335i

He cut it open and welded in those straight pipes and everything..!?

Lol it's a simple bolt on, just search downpipe install on YouTube and you'll find a tutorial.

BeastMode335i · 10-06-2015, 06:39 PM

Quote:

Originally Posted by Rock&Roll

Lol it's a simple bolt on, just search downpipe install on YouTube and you'll find a tutorial.

Oh sorry I was thinking you meant you had someone modify your exhaust to sound like a PE exhaust lol..

PNWN54 · 10-06-2015, 08:51 PM

Cold start with light revs.

335socal · 10-06-2015, 10:33 PM

Anybody here fron san diego knows where to get this done? I asked local shops around my area and they dont want to do it.

melloww22 · 10-07-2015, 01:57 AM

Quote:

Originally Posted by 335socal

Anybody here fron san diego knows where to get this done? I asked local shops around my area and they dont want to do it.

Hey buddy let me know if you find a shop. I been looking too. I found a few shops near Kearny Mesa but then yelped them... Found really bad reviews.

Let's tackle this and maybe we can get a good price if the shop is doing two instead of one

335socal · 10-07-2015, 06:54 AM

Quote:

Originally Posted by melloww22

Hey buddy let me know if you find a shop. I been looking too. I found a few shops near Kearny Mesa but then yelped them... Found really bad reviews.

Let's tackle this and maybe we can get a good price if the shop is doing two instead of one

Will do. I will keep you posted. The one in kearny will do it? You went there and told them what you want to get done and they said they will het it done?

PNWN54 · 10-09-2015, 04:33 PM

Here's couple revs for you guys:

deeLow · 10-10-2015, 03:38 AM

Hopefully you guys can help me out here:

I recently bought a e92 and the stock appearing exhaust is louder than my old e90 I had.

I noticed from looking underneath on the driver side pipe before the muffler there is a clamp, and in between both mufflers there is a clamp. Nothing on the passenger side muffler.

I looked and felt around for welds or anything abnormal besides the clamps and didn't come up with anything.

Car is completely stock.

One thing I must say is the exhaust note sounds much better than the E90 did. Similar tone just louder. Both had the exhaust flap unplugged for extra loudness.

10-01-2015, 06:57 AM	#1571
MJ80. Major 204 Rep 1,103 Posts Drives: E92 335i DCT Individual Join Date: Oct 2013 Location: Gold Coast, Australia. iTrader: (0)	Fucken love rasp want more of it.
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10-01-2015, 11:52 PM	#1572
b1mmr Major 319 Rep 891 Posts Drives: 2008 335XI E90 Join Date: Jun 2015 Location: Ohio iTrader: (0)	Honestly if I knew I was going to cut all cats and mod the exhaust I probably would have left my resonator but hey it's a little late for that __________________ Formerly Ian_N54 - @b1mmr
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10-06-2015, 10:53 AM	#1573
PNWN54 MR. Rocket 45 Rep 398 Posts Drives: 2010 E92 335i M-Sport Join Date: May 2013 Location: Portland, OR iTrader: (2) Garage List 2010 E92 BMW 335i [0.00]	Got my downpipes installed and the exhaust purrs!!! A lot more aggressive exhaust note and the rpms are more pronounced. Cold starts are noticeably louder and 1st gear has a little bit of rasp around 5-6k but it's not the rasp that caught me off guard but the sudden volume increase, it's almost as if volume went from 5-10 real quick. Lol Seems like 2nd and 3rd gear rasp is almost non apparent. __________________ \|2010 E92 335i 6MT\\\M-Sport///225M 19" Rims, MHD PTF Stg 2+, Fuel IT Stage 2 LPFP, VRSF Downpipes, CDV Delete, ER CP & 5" IC, Forge DV, PE Modded Mufflers, BMS DCI & Cowl Delete, CYBA Tips, ST Coils, M3 Control Arms, E93 M3 Sway Bar, Michelin PSS\|
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10-06-2015, 08:51 PM	#1579
PNWN54 MR. Rocket 45 Rep 398 Posts Drives: 2010 E92 335i M-Sport Join Date: May 2013 Location: Portland, OR iTrader: (2) Garage List 2010 E92 BMW 335i [0.00]	Cold start with light revs.
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10-06-2015, 10:33 PM	#1580
335socal Captain 81 Rep 704 Posts Drives: Alpine white 335 coupe Join Date: Mar 2013 Location: National city iTrader: (3)	Anybody here fron san diego knows where to get this done? I asked local shops around my area and they dont want to do it.
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10-09-2015, 04:33 PM	#1583
PNWN54 MR. Rocket 45 Rep 398 Posts Drives: 2010 E92 335i M-Sport Join Date: May 2013 Location: Portland, OR iTrader: (2) Garage List 2010 E92 BMW 335i [0.00]	Here's couple revs for you guys:
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10-10-2015, 03:38 AM	#1584
deeLow DOPE 148 Rep 758 Posts Drives: F80 Join Date: Jan 2014 Location: Earth iTrader: (2)	Hopefully you guys can help me out here: I recently bought a e92 and the stock appearing exhaust is louder than my old e90 I had. I noticed from looking underneath on the driver side pipe before the muffler there is a clamp, and in between both mufflers there is a clamp. Nothing on the passenger side muffler. I looked and felt around for welds or anything abnormal besides the clamps and didn't come up with anything. Car is completely stock. One thing I must say is the exhaust note sounds much better than the E90 did. Similar tone just louder. Both had the exhaust flap unplugged for extra loudness.
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