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Another Exhaust Question on diameter Rate Topic: -----

#1 User is offline   tchnprgrmr Icon

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Posted 04 November 2009 - 12:18 AM

OK, I currently have straight-pipes on my car, but it is "stock". So from the turbo-back I have no cat or muffler but it is still a 2.25" diameter.

Now my question. Would I notice any gain besides sound in going to a 3" turbo-back straight pipe exhaust? Will increasing the diameter by .75" make a noticable performance difference?

I know people have a decent increase in going from stock to the 3" downpipe & 2.5" exhaust, but the only restriction I currently have might be the diameter.
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#2 User is offline   damitzmike Icon

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Posted 04 November 2009 - 12:23 AM

more exhaust flow = more powa!
96' 854R white 95K miles. ST 17psi. Japan Manifold. 3" dp and exhaust. Msd blaster. Ipd wires. Ipd sr5t. Forge Motorsport bov. Ipd HD TCV. HD endlinks.
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#3 User is offline   Kibim Icon

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Posted 04 November 2009 - 12:56 AM

Depends what turbo you're running. I don't think it'll make much of a difference if you're stock up front. Even with de-cat and downpipe, the turbo is normally the bottleneck.


I've got a 3" straight-through turboback system on the S70, with a GT3582R. It flows nicely. I had the 3" system with the 18T, and noticed a gain, but nothing HUGE over just the de-cat. (other than bending a rod on a boost spike :| )
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#4 User is offline   tchnprgrmr Icon

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Posted 04 November 2009 - 01:18 AM

hmm...

I have a 15G on it with the angle exhaust housing. I probably won't be going any larger than a 18T, or maybe a S60R turbo if i'm feely crazy. I don't want to kill the internals on my daily LPT. <_<
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#5 User is offline   Bah Icon

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Posted 04 November 2009 - 02:40 AM

3inch Turboback with all mandrel bends = the only way to go.

Now if only i could buy my OBX DP and afford 600$ for a shop to make a good system =p
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#6 User is offline   Ian Carr Icon

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Posted 04 November 2009 - 02:49 AM

most noticeable difference you will find is from a DP.
Ian Carr - 99' Volvo S70 T5M - 86' Porsche 944 Turbo - 88' Ford Festiva
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