Resonator delete needs a H-pipe for proper boost?

robc1976 · 06-01-2012, 03:37 PM

Hey, what is your opinion on this guys...I am getting my resonator deleted and the muffler shops say I need a H pipe to balance out the exhaust if I delete the resonator or it will not boost right since it is twin turbo (he stated something about boosting at different times)...I am not a exhaust guru but out of all the resonator threads I have seen this has not been stated, just want to be sure.

bryce · 06-01-2012, 03:44 PM

not necessary at all. some aftermarket exhausts run fully divorced (no h-pipe or x-pipe, AE performance for example). others have h-pipes and x-pipes. the n54 boost control doesn't care what kind of exhaust setup you have, it won't run into any issues with "not boosting right"

5soko · 06-01-2012, 03:48 PM

Doesnt matter... I am running a fully divorced exhaust and it sounds great and performs great.

robc1976 · 06-01-2012, 04:11 PM

Quote:

Originally Posted by bryce

not necessary at all. some aftermarket exhausts run fully divorced (no h-pipe or x-pipe, AE performance for example). others have h-pipes and x-pipes. the n54 boost control doesn't care what kind of exhaust setup you have, it won't run into any issues with "not boosting right"

Exactly what I what I needed!

robc1976 · 06-01-2012, 04:12 PM

Quote:

Originally Posted by 5soko335i

Doesnt matter... I am running a fully divorced exhaust and it sounds great and performs great.

Awesome!

Brey335i · 06-01-2012, 05:22 PM

What is up with everyone taking the car to shops that have useless technicians these days...

triggz · 06-02-2012, 10:03 AM

Quote:

Originally Posted by Brey335i

What is up with everyone taking the car to shops that have useless technicians these days...

+1

migue90 · 06-02-2012, 12:59 PM

I'm not sure if it is affected but maybe he was thinking that it's a sequential turbo system

robc1976 · 06-02-2012, 06:51 PM

Quote:

Originally Posted by migue90

I'm not sure if it is affected but maybe he was thinking that it's a sequential turbo system

Pretty sure he was, he is no dummy....has a 500+ STI.

robc1976 · 06-02-2012, 06:52 PM

Quote:

Originally Posted by Brey335i

What is up with everyone taking the car to shops that have useless technicians these days...

So by one statement you know he's dummy LOL!

Lulz_M3 · 06-02-2012, 07:38 PM

Either you are not understanding what the guy at the shop said,or he is truly mistaken. Hpipe is definitely not needed.

cn555ic · 06-02-2012, 08:18 PM

H-pipe and Xpipe basically changes the frequency of the exhaust note...

robc1976 · 06-02-2012, 09:31 PM

Quote:

Originally Posted by Lulz_M3

Either you are not understanding what the guy at the shop said,or he is truly mistaken. Hpipe is definitely not needed.

I asked him today about it and he thought it was a sequential turbo system...my fault for not hearing that and sating that.

Brey335i · 06-02-2012, 09:47 PM

Quote:

Originally Posted by robc1976

So by one statement you know he's dummy LOL!

Yes.

acdHQK713K · 07-12-2012, 06:51 PM

Just did a resonator delete today with a Magnaflow x-pipe. Sounds great! I have catless DPs, stock mufflers, stock 2nd cats in place.

No drone, but it sure livened things up a bit under heavy throttle. I highly recommend this for all those e90's out there who don't want the headaches or expenses associated with a full exhaust.

Sered · 07-12-2012, 08:08 PM

Quote:

Originally Posted by robc1976

So by one statement you know he's dummy LOL!

Yup, making a statement like that shows he's very much out of his depth of understanding. It's not just a wrong statement, it's a very ignorant statement. Sequential, parallel, whatever it doesn't matter. Dead wrong no matter the situation.

robc1976 · 07-12-2012, 08:40 PM

Quote:

Originally Posted by Sered

Yup, making a statement like that shows he's very much out of his depth of understanding. It's not just a wrong statement, it's a very ignorant statement. Sequential, parallel, whatever it doesn't matter. Dead wrong no matter the situation.

I actually have to agree on this one lol!!

robc1976 · 07-12-2012, 08:41 PM

Quote:

Originally Posted by Stangorang

Just did a resonator delete today with a Magnaflow x-pipe. Sounds great! I have catless DPs, stock mufflers, stock 2nd cats in place.

No drone, but it sure livened things up a bit under heavy throttle. I highly recommend this for all those e90's out there who don't want the headaches or expenses associated with a full exhaust.

I love mine as well.

mkent · 07-12-2012, 10:17 PM

One purpose of the cross over pipe (x or h pipe) is to balance the back pressure from bank to bank. If you have higher back pressure in one bank than the other, then your turbo will spool differently, thus, "not boost right" in the words of your mechanic. The exhaust on these 335i are pretty straight and run right beside eachother from turbo to tail pipe...equal length and diameter means equal flow unless you stick a potato in the tail pipe.
The crossover pipe will change your exhaust note and I've heard it can be used for exhaust tuning, but I don't know alot about that part of the equation.

It's been a while since I looked under my car...do these exhausts not already have a cross over pipe?

06-01-2012, 03:37 PM	#1
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	Resonator delete needs a H-pipe for proper boost? Hey, what is your opinion on this guys...I am getting my resonator deleted and the muffler shops say I need a H pipe to balance out the exhaust if I delete the resonator or it will not boost right since it is twin turbo (he stated something about boosting at different times)...I am not a exhaust guru but out of all the resonator threads I have seen this has not been stated, just want to be sure. __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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06-01-2012, 03:44 PM	#2
bryce Banned 103 Rep 3,177 Posts Drives: zhp 3-pedal Join Date: May 2010 Location: texas iTrader: (22) Garage List 2005 bmw 330ci zhp [7.34] 2008 bmw 135i- sold [6.00] 2007 bmw 335i- sold [7.14]	not necessary at all. some aftermarket exhausts run fully divorced (no h-pipe or x-pipe, AE performance for example). others have h-pipes and x-pipes. the n54 boost control doesn't care what kind of exhaust setup you have, it won't run into any issues with "not boosting right"
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06-01-2012, 03:48 PM	#3
5soko Brigadier General 333 Rep 4,632 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	Doesnt matter... I am running a fully divorced exhaust and it sounds great and performs great. __________________ Current: E63S AMG 4matic RENNtech \|\| M5 Evolve..Eventuri \|\| F10 LCI 535i MHD
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06-01-2012, 05:22 PM	#6
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	What is up with everyone taking the car to shops that have useless technicians these days...
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06-02-2012, 12:59 PM	#8
migue90 Second Lieutenant 6 Rep 200 Posts Drives: 07 335i Join Date: Aug 2009 Location: N E W Jerz iTrader: (2)	I'm not sure if it is affected but maybe he was thinking that it's a sequential turbo system __________________ stockeroni and cheese?
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06-02-2012, 07:38 PM	#11
Lulz_M3 Banned 33 Rep 1,029 Posts Drives: AW 335i 6MT Join Date: Oct 2011 Location: Jax, Fl iTrader: (0)	Either you are not understanding what the guy at the shop said,or he is truly mistaken. Hpipe is definitely not needed.
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06-02-2012, 08:18 PM	#12
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	H-pipe and Xpipe basically changes the frequency of the exhaust note...
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07-12-2012, 06:51 PM	#15
acdHQK713K Major 231 Rep 1,473 Posts Drives: Car Join Date: Mar 2010 Location: USA iTrader: (9)	Just did a resonator delete today with a Magnaflow x-pipe. Sounds great! I have catless DPs, stock mufflers, stock 2nd cats in place. No drone, but it sure livened things up a bit under heavy throttle. I highly recommend this for all those e90's out there who don't want the headaches or expenses associated with a full exhaust.
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07-12-2012, 10:17 PM	#19
mkent New Member 2 Rep 29 Posts Drives: 2008 335i Join Date: Aug 2011 Location: Michigan iTrader: (0)	One purpose of the cross over pipe (x or h pipe) is to balance the back pressure from bank to bank. If you have higher back pressure in one bank than the other, then your turbo will spool differently, thus, "not boost right" in the words of your mechanic. The exhaust on these 335i are pretty straight and run right beside eachother from turbo to tail pipe...equal length and diameter means equal flow unless you stick a potato in the tail pipe. The crossover pipe will change your exhaust note and I've heard it can be used for exhaust tuning, but I don't know alot about that part of the equation. It's been a while since I looked under my car...do these exhausts not already have a cross over pipe?
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