I am hopefully picking up my mach tomorrow, and i couldn't help notice that its redline was 6k or so, and i know atleast the 5 speed is 7k, what gives?

and the guys recommend the bassani x, but i want one with interchangable cats and straight pipe like slp's x, plus im hopin to find one that the cats, when on, dont hang as low as my gt so when i get a drop it dont drag everywhere! i took it to the local shop to have it put on, i have no tools, plus i had them tac it in place. all around a great product and no complaints so far!