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Working with Dennis Mecham* of Mecham Design & Performance (that's him!), we dyno his '98 GTP project car. This 400 mile car was stock at the time of the test with the exception of a cat-back exhaust. The stock factory airbox and filter element was used as well as stock wheels and tires.
*Remember those Macho Trans Ams from '77-'85 from Mecham Racing? Well, he's back...

Dyno runs courtesy of ProDyno of Tempe, AZ (602) 967-5550

Summary:

Peak HP Peak Torque HP@3900
Totally stock

NA

NA
Cat-back exhaust

195.3

265.9
Optimized tuning + exh

198.1

287.7

165
3.5" pulley + tuning + exh

225.4

337.5

201

Unfortunately, a totally stock run without exhaust mods was not available. It is also interesting to note that the greatest power increase occurred at 3900 rpm, with significant increases in the midband region of 2500-4000 rpm.

 
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