Benefits of a FULL 3" exhaust

Nicky92 · 04-13-2015, 01:09 PM

I have a custom exhaust shop down the block from my job, they do custom mandrel bending up to 4". They are the best around, they do insane work.

I want to cut the 2.5" tapers off the downpipes, install flanges there. Then have custom made 3" piping all the way out. I am catless, with vibrant resontators and borla mufflers, obviously have to change them to 3" also.

Would I be seeing any gains from this? Or would it be too much work for what it'll gain

I am about to be running MMP inlets, i am FBO, meth, E85 with walbro 255.

einbruch10 · 04-13-2015, 01:48 PM

You won't see any difference with the stock turbos.

Nicky92 · 04-13-2015, 01:57 PM

Didn't think so

einbruch10 · 04-13-2015, 02:32 PM

The turbos are really small anyways. Not saying they don't perform, but it wouldn't hurt to have a 3" exhaust in the short term if you plan on switching to bigger turbos.

Mike@N54Tuning.com · 04-13-2015, 02:38 PM

Quote:

Originally Posted by Nicky92

I have a custom exhaust shop down the block from my job, they do custom mandrel bending up to 4". They are the best around, they do insane work.

I want to cut the 2.5" tapers off the downpipes, install flanges there. Then have custom made 3" piping all the way out. I am catless, with vibrant resontators and borla mufflers, obviously have to change them to 3" also.

Would I be seeing any gains from this? Or would it be too much work for what it'll gain

I am about to be running MMP inlets, i am FBO, meth, E85 with walbro 255.

I doubt you will see any appreciable gains on stock turbos. The dual 2.5" exhaust flows pretty well as its a true dual exhaust.

Mike

Jeff@TopGearSolutions · 04-13-2015, 02:46 PM

Not sure if anyone has really done it to know for sure on the gains.

Fast35i · 04-13-2015, 03:18 PM

Just run the 3 inch pipe with the Vibrant resonator only
(No mufflers)

zeenon53 · 04-14-2015, 03:18 AM

If your still running the stock exhaust you should. It's the only thing missing from your signature.

04-13-2015, 01:09 PM	#1
Nicky92 Fastest 335 on Earth 44 Rep 426 Posts Drives: 2008 335i Join Date: Feb 2014 Location: Levittown, NY iTrader: (0)	Benefits of a FULL 3" exhaust I have a custom exhaust shop down the block from my job, they do custom mandrel bending up to 4". They are the best around, they do insane work. I want to cut the 2.5" tapers off the downpipes, install flanges there. Then have custom made 3" piping all the way out. I am catless, with vibrant resontators and borla mufflers, obviously have to change them to 3" also. Would I be seeing any gains from this? Or would it be too much work for what it'll gain I am about to be running MMP inlets, i am FBO, meth, E85 with walbro 255. __________________ E92 335i, 6MT- YouWish Single turbo, Precision 6466, Doc Race intake manifold w/port injection, Precision Raceworks coil packs and Stage 3 lpfp, 3.46 geared Mfactory LSD, VRSF 3.5" single exhaust, Toyo R888Rs, Spec Stage 3+ clutch, DSS axles, RTD shifter, Motiv, boost box and flex fuel, WOTBOX, MOTIV tuned...and much more
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04-13-2015, 01:48 PM	#2
einbruch10 these are the times that try mens soul's 37 Rep 280 Posts Drives: 2008 335i Join Date: Dec 2013 Location: columbus georgia iTrader: (2)	You won't see any difference with the stock turbos.
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04-13-2015, 01:57 PM	#3
Nicky92 Fastest 335 on Earth 44 Rep 426 Posts Drives: 2008 335i Join Date: Feb 2014 Location: Levittown, NY iTrader: (0)	Didn't think so __________________ E92 335i, 6MT- YouWish Single turbo, Precision 6466, Doc Race intake manifold w/port injection, Precision Raceworks coil packs and Stage 3 lpfp, 3.46 geared Mfactory LSD, VRSF 3.5" single exhaust, Toyo R888Rs, Spec Stage 3+ clutch, DSS axles, RTD shifter, Motiv, boost box and flex fuel, WOTBOX, MOTIV tuned...and much more
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04-13-2015, 02:32 PM	#4
einbruch10 these are the times that try mens soul's 37 Rep 280 Posts Drives: 2008 335i Join Date: Dec 2013 Location: columbus georgia iTrader: (2)	The turbos are really small anyways. Not saying they don't perform, but it wouldn't hurt to have a 3" exhaust in the short term if you plan on switching to bigger turbos.
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04-13-2015, 02:46 PM	#6
Jeff@TopGearSolutions 3474 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Not sure if anyone has really done it to know for sure on the gains.
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04-13-2015, 03:18 PM	#7
Fast35i Private First Class 23 Rep 188 Posts Drives: 2016 f82 M4 , 2011 335is cou Join Date: Aug 2014 Location: Bowie iTrader: (0)	Just run the 3 inch pipe with the Vibrant resonator only (No mufflers)
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04-14-2015, 03:18 AM	#8
zeenon53 Major 44 Rep 1,155 Posts Drives: BMW Join Date: Apr 2010 Location: obx iTrader: (3)	If your still running the stock exhaust you should. It's the only thing missing from your signature. __________________ 2016 340i xdrive 2009 335i
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