Exhaust? X-pipe or straight through-why?

HyperM3 · 03-21-2007, 10:55 AM

Ok, we now have several manufacturers coming out with exhaust for our cars. Some have a built in x-pipe(crossover) and others are straight through.

Shiv's is straight through and recommends exhaust without the x-pipe to get the full potential.

If thats the case, why are these top-notch companies'(Milltek) putting crossovers in theirs. Obviously they do R&D so they must have come up with some idea.

If it comes down to sound being muffled then I understand, but if people want performance, they should have options. At least available baffles that you can put in or take out to keep sound down. Thats something Thermal offers on their exhaust for Audis.

Evo8MRto335I · 03-21-2007, 11:20 AM

Having a X pipe is in my opinion the most retarded design ever made for an exhaust. What are the really advantages of a design that makes the flow to be altered and disrupted?

Go to your backyard and have to water hoses with water shotting at 100mph collide and see what happens.

Water and gases have some flow similarities, the flow of less resistance overrules. Why in the hell would you want a X pipe to disrupt and slow down flow?

Not to mention that whenever maintenance needs to be done the weight of both pipings are increased because the cat-backs are united.

If someone can please "explain" the benefits of a X pipe maybe I buy beer.

my .2c

I am with Vishnu on that, straight flow always overrules on turbo cars.

Carlos

chris b. · 03-21-2007, 11:33 AM

subscribing.......

HyperM3 · 03-21-2007, 11:33 AM

Quote:

Originally Posted by Evo8MRto335I

Having a X pipe is in my opinion the most retarded design ever made for an exhaust. What are the really advantages of a design that makes the flow to be altered and disrupted?

My point exactly. So why is every exhaust being made now pretty much incorporating this backwards design?

bnj · 03-21-2007, 12:47 PM

Quote:

Originally Posted by HyperM3

Ok, we now have several manufacturers coming out with exhaust for our cars. Some have a built in x-pipe(crossover) and others are straight through.

Shiv's is straight through and recommends exhaust without the x-pipe to get the full potential.

If thats the case, why are these top-notch companies'(Milltek) putting crossovers in theirs. Obviously they do R&D so they must have come up with some idea.

If it comes down to sound being muffled then I understand, but if people want performance, they should have options. At least available baffles that you can put in or take out to keep sound down. Thats something Thermal offers on their exhaust for Audis.

Where do you find the info that Milltek has X-pipe? I hope not...

HyperM3 · 03-21-2007, 01:01 PM

Quote:

Originally Posted by bnj

Where do you find the info that Milltek has X-pipe? I hope not...

I cant find pics anymore of the Miltek but I see the Ultimate Racing and CPE exhausts both have it.

bnj · 03-21-2007, 01:11 PM

AA doesn't have X-Pipe. I believe Milltek doesn't have it either. Don't know for sure, though.

Big Daddy · 03-21-2007, 01:38 PM

BD

HyperM3 · 03-21-2007, 01:40 PM

Quote:

Originally Posted by Big Daddy

BD

Awesome job at trying to get your post count up!!!

Big Daddy · 03-21-2007, 01:45 PM

Quote:

Originally Posted by HyperM3

Awesome job at trying to get your post count up!!!

trust me if my intentions were as you comment then i could have 4-500 by now BUT since it wasn't i'd have to say it was done in order to receive email notification.

BD

HyperM3 · 03-21-2007, 01:53 PM

Quote:

Originally Posted by Big Daddy

trust me if my intentions were as you comment then i could have 4-500 by now BUT since it wasn't i'd have to say it was done in order to receive email notification.

BD

For future reference, you can just go to the "thread tools" pull down at the top and click "subscribe to thread". However, if you knew about that then you were not adding anything to the thread except a count in your favor.

Big Daddy · 03-21-2007, 01:54 PM

i'm aware of that thanks anyway. and BTW don't sweat my post count or anyone elses just worry about yourself and things will carry on as normal.

BD

SoCal335i · 03-21-2007, 01:59 PM

I think but dont hold me to it but the crossover pipe (x-pipe) may reduce the raspy sound in the exhaust. Since most companies are using straight thru resonated design mufflers the crossover pipe may help balance the air going thru and control the sound a bit.

cgnahc · 03-21-2007, 02:06 PM

Quote:

Originally Posted by Evo8MRto335I

Having a X pipe is in my opinion the most retarded design ever made for an exhaust. What are the really advantages of a design that makes the flow to be altered and disrupted?

Go to your backyard and have to water hoses with water shotting at 100mph collide and see what happens.

Water and gases have some flow similarities, the flow of less resistance overrules. Why in the hell would you want a X pipe to disrupt and slow down flow?

Not to mention that whenever maintenance needs to be done the weight of both pipings are increased because the cat-backs are united.

If someone can please "explain" the benefits of a X pipe maybe I buy beer.

my .2c

I am with Vishnu on that, straight flow always overrules on turbo cars.

Carlos

Alright! Free beer!

This is a possible explanation concerning your fluid dynamics question. There is laminar and turbulent flow. X-over creates turbulent flow. Believe it or not, turbulent flow moves faster than laminar flow. This has been very well documented for flow kinematics. Thus the possible X-over design. I believe if there are fins arranged inside the tube to create a vortex, such as the spiral grooves in the gun barrel, exhaust may exit faster.

Ryan.M · 03-21-2007, 06:53 PM

I was always under the impression that X-pipes offer substantially better balancing of the exhaust gas pulses. It all comes down to gas velocity. The X-pipe will have better flow.

HyperM3 · 03-21-2007, 07:14 PM

Quote:

Originally Posted by Ryan@Eisenhaus

The X-pipe will have better flow.

Which coming from an exhaust maker brings me to my original question. Why would Shiv say his exhaust is better without it and why would Miltek(I was wrong originally) also not incorporate one? I can only assume that everyone is dynotesting theirs.

Shiv or anyone else(manufacturing exhaust) care to chime in at anytime please.

ac2 · 03-22-2007, 02:55 AM

http://www.moddedmustangs.com/ford-m...-upgrades.html

This site explains it, read the Mid pipes section.
And this
http://www.drgas.com/articles/art_syncronicity.php

lkraven · 03-22-2007, 03:10 AM

This site actually has a better explanation-- I don't know whether or not it applies to the 335i, but the stock exhaust DOES have an x-pipe, if I am correct...

http://www.enjoythedrive.com/content/?id=10185

ac2 · 03-22-2007, 03:16 AM

335 has H pipe.

Jonmartin · 03-22-2007, 03:33 AM

Quote:

Originally Posted by ac2

http://www.moddedmustangs.com/ford-m...-upgrades.html

This site explains it, read the Mid pipes section.
And this
http://www.drgas.com/articles/art_syncronicity.php

Thanks it's an intresting read

Jonmartin · 03-22-2007, 03:34 AM

Quote:

Originally Posted by ac2

335 has H pipe.

it has an X-Pipe before the rear axle I saw it yesterday when I was disgussing exhaust options with an installer he was goin on and on about it.

Ryan(e92) · 03-22-2007, 11:56 AM

Quote:

Originally Posted by Ryan@Eisenhaus

I was always under the impression that X-pipes offer substantially better balancing of the exhaust gas pulses. It all comes down to gas velocity. The X-pipe will have better flow.

I FOUND U! WHEN IS THE EXHAUST COMING OUT!!!!

03-21-2007, 10:55 AM	#1
HyperM3 Too many Alex's, from now on, call me Beaufort 342 Rep 6,188 Posts Drives: See Sig Join Date: Feb 2007 Location: Lawrenceville, NJ iTrader: (8)	Exhaust? X-pipe or straight through-why? Ok, we now have several manufacturers coming out with exhaust for our cars. Some have a built in x-pipe(crossover) and others are straight through. Shiv's is straight through and recommends exhaust without the x-pipe to get the full potential. If thats the case, why are these top-notch companies'(Milltek) putting crossovers in theirs. Obviously they do R&D so they must have come up with some idea. If it comes down to sound being muffled then I understand, but if people want performance, they should have options. At least available baffles that you can put in or take out to keep sound down. Thats something Thermal offers on their exhaust for Audis. __________________ 13 HD FatBob 17 A4 Glacier/Black 1st Edition/Pre+/Sport/EurocodeTMD/Racechip 16 S6 (gone),14 S6 (gone),14 S6 (gone),13 S6 (gone),10 S4 (gone) 07 335i(gone)
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03-21-2007, 11:20 AM	#2
Evo8MRto335I Captain 40 Rep 983 Posts Drives: can't list them all Join Date: Feb 2007 Location: Tucson iTrader: (1)	Having a X pipe is in my opinion the most retarded design ever made for an exhaust. What are the really advantages of a design that makes the flow to be altered and disrupted? Go to your backyard and have to water hoses with water shotting at 100mph collide and see what happens. Water and gases have some flow similarities, the flow of less resistance overrules. Why in the hell would you want a X pipe to disrupt and slow down flow? Not to mention that whenever maintenance needs to be done the weight of both pipings are increased because the cat-backs are united. If someone can please "explain" the benefits of a X pipe maybe I buy beer. my .2c I am with Vishnu on that, straight flow always overrules on turbo cars. Carlos
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03-21-2007, 11:33 AM	#3
chris b. Brigadier General 115 Rep 3,345 Posts Drives: zmp e90 Join Date: Oct 2006 Location: White Plains NY iTrader: (1) Garage List 2010 335i [0.00]	subscribing.......
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03-21-2007, 01:11 PM	#7
bnj Banned 14 Rep 1,137 Posts Drives: e92 335i Join Date: Nov 2006 Location: Helsinki iTrader: (0)	AA doesn't have X-Pipe. I believe Milltek doesn't have it either. Don't know for sure, though.
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03-21-2007, 01:38 PM	#8
Big Daddy Enlisted Member 0 Rep 48 Posts Drives: 328i soon Join Date: Mar 2007 Location: Reno, Nv iTrader: (0)	BD
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03-21-2007, 01:54 PM	#12
Big Daddy Enlisted Member 0 Rep 48 Posts Drives: 328i soon Join Date: Mar 2007 Location: Reno, Nv iTrader: (0)	i'm aware of that thanks anyway. and BTW don't sweat my post count or anyone elses just worry about yourself and things will carry on as normal. BD
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03-21-2007, 01:59 PM	#13
SoCal335i Banned 14 Rep 768 Posts Drives: 2007 E92-TT Jet Blk Coral Red Join Date: Jan 2007 Location: Cali iTrader: (2)	I think but dont hold me to it but the crossover pipe (x-pipe) may reduce the raspy sound in the exhaust. Since most companies are using straight thru resonated design mufflers the crossover pipe may help balance the air going thru and control the sound a bit.
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03-21-2007, 06:53 PM	#15
Ryan.M Major 75 Rep 1,029 Posts Drives: E46 M3..E30 325i..72' 2002 Join Date: Oct 2005 Location: Chicago iTrader: (0)	I was always under the impression that X-pipes offer substantially better balancing of the exhaust gas pulses. It all comes down to gas velocity. The X-pipe will have better flow.
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03-22-2007, 02:55 AM	#17
ac2 Private 5 Rep 85 Posts Drives: E92 Join Date: May 2006 Location: N.E. iTrader: (1)	http://www.moddedmustangs.com/ford-m...-upgrades.html This site explains it, read the Mid pipes section. And this http://www.drgas.com/articles/art_syncronicity.php __________________ E92 335i Last edited by ac2; 03-22-2007 at 03:18 AM..
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03-22-2007, 03:10 AM	#18
lkraven Lieutenant 13 Rep 429 Posts Drives: E92 335i Join Date: Mar 2007 Location: SoCal iTrader: (1)	This site actually has a better explanation-- I don't know whether or not it applies to the 335i, but the stock exhaust DOES have an x-pipe, if I am correct... http://www.enjoythedrive.com/content/?id=10185
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03-22-2007, 03:16 AM	#19
ac2 Private 5 Rep 85 Posts Drives: E92 Join Date: May 2006 Location: N.E. iTrader: (1)	335 has H pipe. __________________ E92 335i
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