ok heres the deal, im looking for a hi flow muffler and cat for my 89 k5, the hitch is its gotta be CA smog friendly. anyone done this or know what might work? i know flowmaster makes a muffler that interests me, but dont know about the cat. 2. has anyone with a 2.5 or 3 inch lift needed to modify the crossover pipe on the exhaust? the one that goes under the front driveshaft.