So stock M6s all dyno around 410RWHP (DynoJet numbers) in stock form. Since the dyno-cell is not finished, we ran all of these tests one after the other on a Mustang Dyno.
With JUST the custom straight-pipe exhaust, the car put down 422RWHP which is corrected to 447.03 RWHP! That’s approximately 37RWHP +/- from just the exhaust.
Then, the custom intake was installed. Now, keep in mind, NONE of the tuning has been done, nor have the heat shields been put in place (so the car was running about 15° over what it did with the stock airboxes) but it still picked up an extra (Mustang) 13RWHP. It did 435RWHP which corrects to 461RWHP. Once tuning is done and everything is dialed in, there’s a real shot at 490-500RWHP and it sounds amazing!
You probably remember his straight piped Murcielago.