997TT exhaust mod gains 40 lb ft!
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I just removed my stock exhaust system off the 997 Turbo. I had 100 cell metallic substrate cats installed, about a 3" long turbo muffler (tried to quiet it down, but not too successful) and then tailpipe out the rear bumper. I felt a dramatic difference in power, probably in the tune of 40+ lb ft. of torque. Its pretty damn loud, but will do for now until i get a performance exhaust system for it. I was shocked at the improvement in throttle response and power. The first time I stepped into it in first gear, i bounced the tach off the rev limiter. This thing really spools fast, especially in first and second gears.
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Originally Posted by cooperlee
nice..it this a custom system you had made up with the 100 cats and mufflers or muffler bypass?
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Originally Posted by PorscheDoc
How did you come up with the 40ft/lb gain? Did you dyno it?
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Originally Posted by dk996tt
actually, the 40 ft/lb gain is from my butt dyno. i have dynoed many cars in the past and i must say that my butt dyno is pretty darn accurate.
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I have been running dynos on new systems and the most I have seen is 22 ft lbs which is pretty darn good in AWD. No offensive meant here but the Butt dyno is not really an accurate tool. I like my butt but the Mustang 500SE works a little better
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Originally Posted by allegretto
One must divide by at least 2, and sometimes 4 or greater to convert Butt to Mustang ![Big Grin](https://rennlist.com/forums/images/smilies/biggrin.gif)
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I hope it was not a Dynojet...Do not run a Porsche AWD on a uncoupled AWD dyno. Dynojet uses two different dynos to create 4 rollers. They do not operate at the same speed and will destroy the front diff.
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Originally Posted by PorschePhD
I hope it was not a Dynojet...Do not run a Porsche AWD on a uncoupled AWD dyno. Dynojet uses two different dynos to create 4 rollers. They do not operate at the same speed and will destroy the front diff.
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Originally Posted by dk996tt
actually, the 40 ft/lb gain is from my butt dyno. i have dynoed many cars in the past and i must say that my butt dyno is pretty darn accurate....
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Originally Posted by gota911
If your butt has a crack in it, then it is broken, so the "butt dyno" results may be flawed.
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