Juiced Motorsports has the hot CNC ported heads and stroker kit for your late model Hemi.  Wheather you have a 5.7L or a 6.1L Hemi Challenger you can enjoy huge horsepower gains.  When combined with the proper cam your R/T and SRT8 Challenger can terroize the track and destroy the dyno. 

Comp Cams has the valvetrain in your late model Hemi set.  Add high lift valve springs and high rpm retainers to handle big cams on high horsepower Hemi applications.  Comp Cams should be the only name in valvetrain you trust when it comes to your Hemi.