Anybody ever do a Duramax or big-block swap in a late model K1500 suburban? How big a pain is it? Shoul I just stick with the LQ9 upgrade and do headers/exhaust/cold air intake? How about multi-piston brakes? I use mine as a huntin' bus and boat tower. I run the K&N and a hypertech and still need more oomph (down low) and stopping power. How about body lifts to get some more rubber and air under these? I bottom out and wind up winching just about every year.