I took my truck in for some performance upgrades. They are very easy to work with. They provide awesome service and are very honest with you. They are very good at what they do. I had an awesome first time experience with them and I am looking forward to working with them again.

Got things done at a fast pace while still maintaining quality. Very friendly and helpful when asked questions, will definitely be retuning for all my diesel machining needs.

Kyle and Eric were able to machine my LBZ block that spun a main and save it, help me pick internals for my goal, help me on accumulating parts, and get it all done in a timely manner. 10/10 I will be back with future machine shop needs!

Eric and Kyle were extremely helpful throughout the process of getting my 12v head resurfaced. They also provided great insight for my build and even gave some suggestions. Buying parts from them was a breeze. Very professional and knowledgeable, would recommend their shop to anyone. Thanks again guys!

Always accommodating for the emergency service (I go to them for my field service truck). Sometimes more expensive than the competition, but the work is done right the first time with unbeatable timing! Great shop!

I just ordered from Duernberger for the first time, they had a bracket in stock I've been searching for, the price was more than fair. My parts shipped quickly and arrived exactly as they were advertised. I will be ordering from them in the future.

Kyle runs a business that is second to none. Very professional and does exceptional work, not to mention a very clean and organized shop. The work was done as promised and on time. When I arrived to pick up my engine block and heads, they were wrapped and secured to a pallet to ensure safe transport. Well done.

Extremely nice and great group of guys that know how to get it done right within a timely fashion.

On time with any service preformed, no added costs from quote and most importantly they stand behind their work! Great Family ran shop!

There is a good reason these guys have 5 stars and 100 reviews. I have a 2013 ford f350 powerstroke, and I bought online, S&S fuel rails, and immediately after placing order Eric called me and told me they were on back order and that the Motorcraft rails that they have in stock is the same exact thing but for cheaper. I appreciated that so much that I went ahead and ordered the S&S 30% over fuel injectors from Eric as well. The fuel rails shipped the same day. But of course the injectors have to be built. I understand that. But after almost 4 weeks and still havnt got a valid tracking number Eric contacted S&S and figured out that S&S had made a mistake on the order/shipping. So they made a new order number and Eric covered next day air shipping for me. It wasn't KD Customs fault but he went ahead and covered expedited shipping anyways. That was an awesome thing to do since my truck is down right now. I will definitely do business with them again. Thanks again Eric! You rock!