I recently purchased a new, leftover 2012 SRT8 Challenger 6speed, black with silver stripes. I would like to know if anyone has been able to tune these cars. I am interested in adding long tube headers, full exhaust and CAI; also possibly throttle body and cams. My "other car" is an extensively modified Subaru sti (08). It's last iteration was as a 629rwhp car; unfortunately, the engine didn't live long. This time we are building it for 550rwhp. I want to keep the Challenger fairly mild, but would like to get it to where it will launch and accelerate better. Any help will be appreciated.