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ar0ck · 02-21-2005, 09:09 AM

I see alot of people agree with the cut-outs before the cat. Â*But I dont see substancial evidence that it does anything with a y-pipe. Â*

I once ran my old Trans Am, with an open Y-pipe and I lost MPH at englishtown over a full exhaust. Holly Flowtech Mid-Length headers, Flowtech 2.5" Mander-bent Y-pipe, test pipe, 2.5 Flowmaster Cat-back.

Exhaust Leak- 15.5 @ 88mph
Open Y-pipe - 15.3 @ 85mph
Full Sealed Exhaust - 14.9 @ 91mph

Now I have seen a few cars with cut-outs that have gained 5rwhp over the stock exhaust on a dyno (RJ 2001OrangeSS) So I really dont know what is best. Â*The only reason I would ever run a cut-out is for show.

02-21-2005, 09:09 AM	#15
ar0ck Resident Camera Guy Join Date: Aug 2004 Location: North Jersey Posts: 10,971 iTrader: (2) Social Networks:	I see alot of people agree with the cut-outs before the cat. ÂBut I dont see substancial evidence that it does anything with a y-pipe. Â I once ran my old Trans Am, with an open Y-pipe and I lost MPH at englishtown over a full exhaust. Holly Flowtech Mid-Length headers, Flowtech 2.5" Mander-bent Y-pipe, test pipe, 2.5 Flowmaster Cat-back. Exhaust Leak- 15.5 @ 88mph Open Y-pipe - 15.3 @ 85mph Full Sealed Exhaust - 14.9 @ 91mph Now I have seen a few cars with cut-outs that have gained 5rwhp over the stock exhaust on a dyno (RJ 2001OrangeSS) So I really dont know what is best. Â*The only reason I would ever run a cut-out is for show. __________________