or = to 5.3LHO Silverado 1500? I am questioning the frame to body clearance also? The 2500 has a taller frame. The head pipes are clearley bigger and cats are staggered different. Should flow much better! Not shure if they will fit? I have an '06 1500 Z71,ext.cab w/ an aluminum block H.O.motor, Magnuson Supercharged, Doug Thorley shorty headers, looking to open up exhaust flow!!
