Well Ive purchased these Houston Performance 292 blower regrind cams and comp cams beehive springs for my 2002 Mustang Gt. I plan on installing these whenever i have my next day off. My car is currently N/A with basic bolt ons (Gears,intake,and diablo sport) and will be s/c at a later date. My question is when i install these cam do i need to modify my tune? and also with the springs installed how high of a rpm can i safely and efficiently get up to? Thanks in advance.