It's been a good day today with the 2008. We have been able to try a variety of exhaust combinations, and have the following results to report:
2008 Viper Baseline = 546 rw hp / 515 rw tq
3 inch Stainless Catback Exhaust System = 561 rw hp
(15 rw hp gain over stock)
3 inch Stainless Full Manifold-back Exhaust System with High Flow Cats = 569 rw hp
(23 rw hp gain over stock)
3 inch Stainless Full Manifold-back Exhaust System with No Cats = 575 rw hp / 546 rw tq
(29 rw hp / 30 rw tq gain over stock)
The power gains are pretty even from 3000 to 6000 rpm on all of the above mods.
The factory airbox seems to flow very well and before we tried the exhaust mods we found that there was no power gain by removing the factory air filter and the lower half of the factory airbox. I dont think SRT left any power on the air induction side.
We are headed to the track tomorrow. Pics and videos are coming at some point when I get some time.