Underground Diesel Performance, Inc.

UDP had done multiple work on my cars from 2018 Charger SRT8, Two of my 2005 Exucursions 6.0, & 2018 Ford Raptor. They are prompt and do great work. I know every shop will have horror stories, but I want to state that working on multiple vehicles of mine, I highly recommend them for any of your vehicles

Underground Diesel Performance has always been the best in the business. Andrew has been my go to for years his knowledge, attention to detail, and honesty are unmatched. He consistently delivers top notch work and stands behind everything he does. You can trust that your truck is in the right hands every time.

These guys are the best. We are lucky to have them in Green Cove Springs. Highly recommend.

I dropped off my 2nd and 3rd gen cummin The 3rd gen Cummins was a simply fix they had done with in a week my 2nd gen is still there (Matt and Andrew have been very helpful and reasonable to deal with and help me), the 2nd gen is getting a pump swap and I couldn’t afford payment right off rip and they have held on to truck at there shop and let me make payments to get what I need for my truck. As a first time customer with them they could have made me pay full price for parts but they let me make payments which is amazing because I am a first time customer ( I will only use UDP- Underground diesel performance for now) with any of my diesel vehicles currently and in the future!!! Honestly keep up the great work. Guys and thank you for everything you’ve help me with so far

Had an awesome experience with these guys. Trustworthy and extremely knowledgeable. You don't know how lucky we are to have this quality of diesel mechanic down near us. Before I found these guys I had to drive up on the Northside and beg to get in with a fleet mechanic, and if I was lucky maybe they would get my truck back to me in 3 weeks for a 2 day job. Having these guys around will get you every last mile possible out of your truck.