It's a 5.3 with just bolt-ons and a BB tune. The exhaust was sticking out only about a half inch until last week when I dragged my muffler a little bit and it pushed it out about 3 inches. I'm gonna fix it this weekend
I did that bumper set up in 2000 before the 2nd gen Escalade came out
Here is a couple pics of the rear setup. Its a parallel 4-link with a custom watts link and cantilever. Re8's on all 4corners, york 209 compressor and 14 gallons of air