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A26B · 07-03-2007

Picture are how it USED to be. Now, there is an x-pipe where the muffler used to be, no mufflers at all. It's all 3" mandrel bent from header collectors back. The exhaust is all custom built and was necessitated by the LPE Aerobody center outlet.

As far as the backpressure in the ZR-1 cat system.....I recall, possibly wrongly, that Marc Haibeck dyno tested and found that only eliminating the cats made no noticable difference in rwhp. Not sure about this, but if it's so, I think it's reasonable to infer that the cats do not create appreciable backpressure to the exhaust system on a ZR-1.

07-03-2007	#8
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,402	Re: hulling out the cats Picture are how it USED to be. Now, there is an x-pipe where the muffler used to be, no mufflers at all. It's all 3" mandrel bent from header collectors back. The exhaust is all custom built and was necessitated by the LPE Aerobody center outlet. As far as the backpressure in the ZR-1 cat system.....I recall, possibly wrongly, that Marc Haibeck dyno tested and found that only eliminating the cats made no noticable difference in rwhp. Not sure about this, but if it's so, I think it's reasonable to infer that the cats do not create appreciable backpressure to the exhaust system on a ZR-1. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.