How fast are the hummers with a 6.2 and a tune? Any ideas? Thanks

 

My uncles 09 did 0 to 60 in mid 8s dynoed 298rwhp 320rwtq and after the long tube hears CAI corsa exhaust and dyno tuned with hptuners it made 331rwhp and 352rwtq and did 0 to 60 in low 7s he did all that work to tow and got good mpg he gets about 13city 17 highway vs his 9city and 11highway

 

I bet they are beasts on mudd terrain or offroading lol