Duramax.willard

Thats without CAI. I just ordered S&B intake a week ago or so but it was backordered. The gains were all from the exhaust. They seemed crazy but i saw it happen and it's all on paper. I don't know how much the kit is going for now, i was literally the 1st one they ever built so i got a pretty good deal in exchange for letting them prototype and dyno my truck for two weeks. It's Heartthrob exhaust in Litchfield, MN. Google them and call their office. Tell Jeremy or Mike i referred you and im sure they'll treat you right. I'll dyno again after CAI and post those results too.

I have a 2019 Denali with a 6.2l, had a custom made exhaust from Heartthrob Exhaust designed and built (now available as a kit from their website, you're welcome). Dyno sheets showed a 52rwhp gain. Noticeably different while driving and not obnoxiously loud at all. Yellow is before, green after. See video of sound here.