I was a bit concerned with the cost. Now that it’s installed I would have paid double. It feels like a completely different truck. It honestly feels like I swapped the 5.3 out for a 6.2Very impressed and completely satisfied!!Instantly you feel the power unleash with the 10 speed. It shifts smoothly and the power is great. I had this one on my 2019 but didn’t enjoy as much as I’m enjoying now. Just for information works with 22 refreshed Silverado.Makes a big difference to how the truck accelerates. I've had this on my last 2 trucks and it will always be my first upgrade.This saved me 2.5 mpg in econo mode and made a great increase in throttle response in the performance modes.This will not help with gas mileage. But you don’t have to mash your gas pedal down to get a good response. Lost of settlings choice to match your driving habitsI installed it on my 2021 2500hd Duramax it work great it arrived early great jobThe one I ordered here was opened when I received it - and after installation immediately caused electrical issues. I returned it and ordered direct - no issues at allIt was cool for a day, then check engine lights started coming on for the dumbest things (never had an issue). There was a pcv code, then a brake light code, then flashing engine light.. I unplugged the battery, unplugged the unit and waited 30 min to reinstall battery. All problems went away.. this was on a 2020 Silverado 1500 v6. Just get an intake and exhaust… it’s reliable and always consistent.