I have a 02 Tahoe 4x4 lq4 and use the 5.3 corsa exahust, was going to buy 6.o yukon or escalade touring exhaust and looks like dual pipes into muffler. Might not fit my front pipe. should I use 5.3 system or yukon system. Can someone tell me what front pipe / cat set up I need for the corsa direct fit exhaust. Or will my corsa flow just as well as Yukons. My Corsa Sport whistles know under a real hard wot, exhaust air is pushing hard out 4" tail pipe tips. Never did this with my 5.3!