The RG is what I run (for now). Its great at making low end power. If you have the extra $20.00, try the Sportwerks .26 (what I will be running). It has slightly less low end than an RG, but will murder it from mid to top. Both like the Jammin JP-2 pipe, and both (as well as most engines) like a 3 shoe aluminum clutch and 1.0 springs.