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Originally Posted by tomhole
Ron,
Go to JBA's web site, they have dyno results. Do a search on here, there are threads with dyno results. One guy has them in his sig.
Short of that, yer gonna have to do it yourself.
Tom
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Here is the link to the dyno chart for a Tundra on JBA's website:
http://www.jbaheaders.com/images/dyno/03tundra_dyno.jpg
This is for a 2003 Toyota Tundra 4.7L 2wd truck, with JBA Cat4ward headers and JBA Evol Exhaust System.
This combo shows a peak gain in torque of 38 ft.lbs - BUT - it's at 3852 RPM, which is pretty high, and 186 higher than stock (the stock system's peak torque is at 3666). The torque gain of the JBA system at 2672 RPM (which is right about 60 MPH in third gear for my truck, a 2000 Tundra) is only 20 ft.lbs. I'd speculate that the Gibson muffler-only solution Ray suggests would do better than the JBA exhaust. Pure speculation, of course.
-Ron