Adam,
Yes the supersprint exhaust system will add only 13hp and 15lbft but, the added Evo's high flow intake system and future ECU upgrade will make this a well rounded package. I am doing one at a time. No price yet on the Supersprint parts. The Cat back system is $1000 and when I find prices on headers and cats I will post. The big advantage is a combo with intake modification plus full exhaust upgrade and ECU. Yes fabspeed and other do the same thing. I started with Supersprint so, this will be go info for those that want to follow should the end results be good.
ciao,
Stanislaus R.R.
Houston, Texas - USA
www.rothbauer.us