N54 4inch exhaust

1justygoblin · 06-06-2020, 06:13 PM

Cant find any info on the topic so I'm posting this. Seeking honest thoughts on running a 4 inch straight pipe with an aftermarket resonator on my e90 n54 with upgraded turbos and CL dps.

Brandoch · 06-06-2020, 06:30 PM

And why?

mweisdorfer · 06-06-2020, 06:41 PM

Quote:

Originally Posted by 1justygoblin

Cant find any info on the topic so I'm posting this. Seeking honest thoughts on running a 4 inch straight pipe with an aftermarket resonator on my e90 n54 with upgraded turbos and CL dps.

I could see maybe 3". I don't think 4" has ever been done, at least I've never read about on this forum.

Bimmer_Bro · 06-06-2020, 06:41 PM

I can’t see a point in going 4inch. My corsa exhaust is 3.5 and it still a little on the large side. It has taken a few different shops to have it aligned properly without touching.

ragingpanda · 06-06-2020, 07:48 PM

I barely have clearance with a 3.5 inch exhaust so a 4 inch most likely will have clearance issues.

nicky dj · 06-06-2020, 07:51 PM

Just get 4" tips on any exhaust system.

1justygoblin · 06-06-2020, 07:53 PM

Smh I figured lol. Had to look up under and really image it there, even the best positioning would be scary

Bimmer_Bro · 06-06-2020, 09:03 PM

Quote:

Originally Posted by 1justygoblin

Smh I figured lol. Had to look up under and really image it there, even the best positioning would be scary

Yup lol. Once you have catless dps, you wouldn’t see a performance difference with 3 inch vs 4.

Silent9n54 · 06-06-2020, 09:19 PM

bigger is not always better

feuer · 06-06-2020, 09:24 PM

Quote:

Originally Posted by Silent11N54

bigger is not always better

Correct. Can cause turbulence in the exhaust flow which isn’t good at all

06-06-2020, 06:13 PM	#1
1justygoblin Registered 0 Rep 2 Posts Drives: 2009 BMW 328i Join Date: Jun 2019 Location: Tampa iTrader: (0)	N54 4inch exhaust Cant find any info on the topic so I'm posting this. Seeking honest thoughts on running a 4 inch straight pipe with an aftermarket resonator on my e90 n54 with upgraded turbos and CL dps.
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06-06-2020, 06:30 PM	#2
Brandoch Lieutenant 504 Rep 505 Posts Drives: 2009 E93 M3 DCT Join Date: Dec 2017 Location: BC Canada iTrader: (0) Garage List 2009 BMW E93 M3 [9.50] 2011 BMW F25 X3 28i [8.50]	And why?
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06-06-2020, 06:41 PM	#4
Bimmer_Bro Captain 393 Rep 972 Posts Drives: 2010 BMW 335xi LCI Join Date: Dec 2019 Location: Calgary Alberta Canada iTrader: (0)	I can’t see a point in going 4inch. My corsa exhaust is 3.5 and it still a little on the large side. It has taken a few different shops to have it aligned properly without touching.
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06-06-2020, 07:48 PM	#5
ragingpanda Banned 321 Rep 751 Posts Drives: 135i Join Date: May 2012 Location: Florida iTrader: (0)	I barely have clearance with a 3.5 inch exhaust so a 4 inch most likely will have clearance issues.
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06-06-2020, 07:51 PM	#6
nicky dj Chelsea Football Club 345 Rep 780 Posts Drives: E92 N54 Join Date: Aug 2012 Location: Irvine iTrader: (0)	Just get 4" tips on any exhaust system.
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06-06-2020, 07:53 PM	#7
1justygoblin Registered 0 Rep 2 Posts Drives: 2009 BMW 328i Join Date: Jun 2019 Location: Tampa iTrader: (0)	Smh I figured lol. Had to look up under and really image it there, even the best positioning would be scary
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06-06-2020, 09:19 PM	#9
Silent9n54 Captain 574 Rep 940 Posts Drives: 2007 E92 335i Join Date: Jul 2017 Location: Vancouver, Canada iTrader: (0)	bigger is not always better __________________ 2007 E92 335i / FBO + Inlets / E85 Custom Tune by WedgePerformance / 9.68 @ 140 / TPC Stage 2 19T / 2.1s 0-60 mph / 2010 535Xi 6MT - 437M - MHD / Instagram @Silent9n54
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