740 Turbo - 3" Exhaust Downpipe

740T · Oct 30th, 2008, 10:26

Guys,

I currently have a "cat back" (cat is actually removed) stainless steel exhaust I think it is around 2" inches in diameter with a 3inch tail pipe. I'm looking at getting the downpipe from the turbo back replaced. This is currently the original 2.5" in diameter. I was thinking of replacing this with 3" diameter.

What are your thoughts on this? Likely power gains?

The engine is b230FT.

Thanks,
C

740T · Nov 6th, 2008, 18:20

Well took the plunge today and had the 3" downpipe fitted. Makes a considerable difference however I think the car is running a bit rich now, noticed some black smoke under acceleration. Does that sound normal? Think I'll need to get the fuelling mix looked at.

Oct 30th, 2008, 10:26	#1
740T Master Member Last Online: Apr 17th, 2024 17:02 Join Date: Sep 2006 Location: Glasgow View Photos By: 740T	740 Turbo - 3" Exhaust Downpipe Guys, I currently have a "cat back" (cat is actually removed) stainless steel exhaust I think it is around 2" inches in diameter with a 3inch tail pipe. I'm looking at getting the downpipe from the turbo back replaced. This is currently the original 2.5" in diameter. I was thinking of replacing this with 3" diameter. What are your thoughts on this? Likely power gains? The engine is b230FT. Thanks, C

Nov 6th, 2008, 18:20	#2
740T Master Member Last Online: Apr 17th, 2024 17:02 Join Date: Sep 2006 Location: Glasgow View Photos By: 740T	Well took the plunge today and had the 3" downpipe fitted. Makes a considerable difference however I think the car is running a bit rich now, noticed some black smoke under acceleration. Does that sound normal? Think I'll need to get the fuelling mix looked at.

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