I got my 08 tuned last June by Mitch with the DSP5 and autocal. I've been very happy with the tunes and use #5, 90hp as my daily driver.
I've just purchased a new Duramax and have already contacted Mitch for the LML tune.
He's very knowledgeable and has great customer support.
Being from Edmonton, I would highly recommend his tunes!
2008 GMC SIERRA 2500HD CCSB SLE2 SOLD
EFI LIVE DSP5 BY COOPER CUSTOM SOLUTIONS | 52 GALLON TITAN FUEL TANK | 4" AFE EXHAUST | SPYDER HEADLIGHTS, TAIL LIGHTS | UNDERCOVER FLEX TONNEAU COVER
2015.5 GMC SIERRA 3500HD CCSB DENALI HD
SUNTEK PPF CLEAR BRA | 4.5 BDS W/ FOX 2.0 | 4" FLOPRO W/ MUFFLER & TWISTER | EFI LIVE BY COOPERS CUSTOM SOLUTIONS | STOCK DELETED | **SUMMER SETUP** 20X9 XD 811 ROCKSTAR 2 SATIN BLACK | 35X12.5X20 TOYO OPEN COUNTRY M/T | **WINTER SETUP** 20X8 OEM POLISHED ALUMINUM W/ BLACK PLASTI DIP | NOKIAN HAKKAPELIITA LT2 STUDDED 275/65R20 | 57 GALLON TITAN FUEL TANK | UNDERCOVER FLEX TONNEAU COVER