Derringer® High Output

Night and day Difference!!

I finally pulled the plug and bought the Derringer tuner for my GMC 2500 HD AT4X. My honest opinion is it’s like driving a totally different truck. I tow a 35 foot fifth wheel regularly and all I can say is Wow! I should have done it earlier! Install was straight forward and Banks install videos are top notch. Very impressive and noticeable improvement in power and throttle response❤️ Yes it’s a lot of money but the smile it put on my face made it worth it😁

2024 GMC 2500Hd Duramax

The install was very easy and straight-forward kudos to banks. As a kit it was a night and day difference. This definitely poked the bear and woke up the truck. Can't wait to give it a full testing with my 44ft 5th wheel in a couple weeks. Great upgrade so far so good.

Four thumbs up

I love it!! The difference is like night and day. My only problem is now I have spend more money to finish the upgrade lol