Ok so let me get this straight, if i want to have long tube headers i have to buy a specail shorty o/r h pipe to fit, then i can put my cat back system on from there? I need to be able to put my stock h pipe on when emissions comes around. So i am guessing that it would not fit meaning i would have to take the headers off too and but the stosk ones back on. Would i be better off going with a shorty header. I know they dont give as much power but is it really a big difference? Or should i get a shorty h pipe with cats, what kind of power difference from lt's with cats vs shorties with out? Why are people saying that the lt's are so hard to install? Really just trying to figure this thing out from the people that know best.