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**Goat Blower** · 03-02-2006

To make a long story short, going to a smaller diameter somewhere downstream in the system is going to be a restriction. If you're doing a 4" downpipe, why the hell would you go down to a 3.5" catback? Run 4" all the way, the best exhaust is no exhaust.

03-02-2006	#9
Goat Blower aka Goodbye Asteroids Champion! Beach Squirter Champion! Join Date: Oct 2003 Location: under the car Drives: Taylor Made R15 Posts: 7,765	Re: Proof of larger DP/ Fluid Dynamics To make a long story short, going to a smaller diameter somewhere downstream in the system is going to be a restriction. If you're doing a 4" downpipe, why the hell would you go down to a 3.5" catback? Run 4" all the way, the best exhaust is no exhaust. __________________ 2009 Corvette Z51-SOLD 1992 Mitsubishi Eclipse GSX-SOLD 2013 BMW Z4-Current summer hooptie 2017 GMC Yukon-Current winter hooptie