i want to know if the procomp engineering CDi is worth the $$ , theyre selling them on ebay for around $100-125.00. Or do i spend 350-400 for the vortec, hpd, or hotseat's CDI. I have only piped my predator, with the HOt Seat hi flow air intake kit, Do i need to change Cams, springs, ect. if i increase my RPM?? thanks, any info would be great. Plus has anyone have the IMS front bumper on their predator? and how does it look?