Ive got an 03' cobra and I want to buy all the exhaust at once, and only one time. im going to buy the Mac 3" system and I want to get kooks longtubes and thei off road x. Well my ? is I got my car lowered with H&R SS springs and it sets pretty low, I expect to scrape some or is an all the time thing cause if its that bad im going to go with the bassani mid-lenghts. Also I plan on doing big mods to my car such as whipple upgraded intercooler, basically all bolt ons around the 600 rwhp range, should I go all 3" or stick with the 2.5" x and 3" catback?