SPeedy's here in Owensboro, Ky finally had a Dyno Day so naturally I joined in. My stock 5.3 other than a K%N FIPK and exhaust put down 220rwhp@4800 and 255.9ft/lbs@4100...I was pretty pleased considering a Hemi went before me and put down 202 rwhp and an 04 Ford 5.4 went after me and put down 192.....i was impressed w/ my truck, the warranty is up in 16000 miles..after that.....