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bradslt5 · 01-05-2008

does your car have the cats still. that makes a difference . i have 2 90s one fully ported with jeal headers and a custom exhaust its quieter than my wifes car that is stk with desert developement exhaust. the xpipe i found make alot of resonance unless one goes with one of the xpipe mufflers on the market . also removing the cats makes the car alot raspier. i have come up with a quiet exhaust for car with headers that doesnt cost any power at all . . here is what it is . 23/4 in to a 3in magnaflow xpipe muffler. 23/4 from there with a small balance tube right at the upturn(a 7hpimprovement on my car)to flowmaster 539712 70series mufflers . i cut off the factory tips and installed them on the mufflers so that it looked like a factory stk setup. we did a same day comparo on a chassis dyno in bakersfield . the car made 423.3hp and 371.6 tq with the desert developemt exhaust 3in and with this setup made 429.7hp and 377.2 tq with this setup. its a very quiet setup with just enough bark when @ full throttle to be heard . my buddy is working on putting in some perferated stainless to line the inside of the tipps to quiet it even more. what i have been looking for is to make it sleeper quiet . which i fanally think i have gotten . at least for me . loud just gives this old guy a headache and lets everyone know where you are.

01-05-2008	#3
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: exhaust question does your car have the cats still. that makes a difference . i have 2 90s one fully ported with jeal headers and a custom exhaust its quieter than my wifes car that is stk with desert developement exhaust. the xpipe i found make alot of resonance unless one goes with one of the xpipe mufflers on the market . also removing the cats makes the car alot raspier. i have come up with a quiet exhaust for car with headers that doesnt cost any power at all . . here is what it is . 23/4 in to a 3in magnaflow xpipe muffler. 23/4 from there with a small balance tube right at the upturn(a 7hpimprovement on my car)to flowmaster 539712 70series mufflers . i cut off the factory tips and installed them on the mufflers so that it looked like a factory stk setup. we did a same day comparo on a chassis dyno in bakersfield . the car made 423.3hp and 371.6 tq with the desert developemt exhaust 3in and with this setup made 429.7hp and 377.2 tq with this setup. its a very quiet setup with just enough bark when @ full throttle to be heard . my buddy is working on putting in some perferated stainless to line the inside of the tipps to quiet it even more. what i have been looking for is to make it sleeper quiet . which i fanally think i have gotten . at least for me . loud just gives this old guy a headache and lets everyone know where you are.