As I said, even stock which meant older models.
You gots to try it and compare all the numbers before and after before you bash it, otherwise the bash doesn't mean squat.
The fronts not all that bad, much better than the models before the LMM with bug eyes for lights.
2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-Route
2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
Last edited by D_R_C; 11-18-2019 at 02:14 PM.