Come to us for a variety of automotive services ranging from basic maintenance to heavy repair.

Some items for off-road use only. Items that modify vehicle emissions control systems without CARB certification are illegal for sale or use in the state of California. Some products are designed for competition racing use only. Use on State and Federal Highways is a violation of the EPA Clean Air Act. The Clean Air Act can be found at This document contains in detail what are considered to be violations of the CAA and corresponding penalties for failure to obey and should be read in full before signing this disclaimer and/or installing this off-road, race use only product. Ensuring that all emissions, noise/sound, and speed/use related laws are followed is the responsibility of the Buyer(s). Installation and use of this product indicates that this disclaimer has been read, acknowledged, and understood fully by the Buyer(s). The Buyer(s) assumes all associated risk of the purchase and/or use of this product. Hollyrock Customs LLC assumes no responsibility of any personal injury, death, or property damage associated with the use of this competition racing use-only product. The Buyer(s) assumes all responsibility of ensuring that all applicable speed and safety restrictions are followed during the use of this product. This includes staying within speed limits of tire rating, engine speed restrictions, and legal competition racing use of the vehicle and associated product.  All local, state, and federal laws and ordinances must be adhered during the use of any installed product. Determining the nature of these laws and ordinances is the exclusive responsibility of the Buyer(s).

Performance Parts  = use at your own risk;   with purchase and installation from Hollyrock Customs LLC buyer(s) declare knowingly that such items and services can void manufacturer's warranty.


HOLLYROCK CUSTOMS is your one stop shop for all your diesel trucks needs. We offer high quality performance parts, complete comprehensive diagnostics, maintenance and repair.

We provide genuine GM, CHEVY, FORD, DODGE, etc., parts and services you rely on to keep your diesel serviced and running just like new.  

****** DPF Cleaning now available!

HOLLYROCK CUSTOMS, LLC  has you covered whether you need an entire Engine or- Rebuild; Transmission, Converter, Turbo, Injectors,  Air box, Air / Fuel / Oil Filters,  Synthetic Changeover,  etc..   Established partnerships with Jasper Engines, S&B Filters, PPEI Tuning, Authorized SunCoast Dealer, most products are stocked and are installed by our staff.

Our services range to meet the diesel race enthusiast, camper / boat /horse/vehicle trailer towing, to the daily driver or above average diesel truck owner with over 200,000 plus miles.
Routine Maintenance- this is the key to the overall life of your diesel. Come see us today for all your diesel truck needs.

With competitive rates and fast service, we’ll give you the best value for your time and money.


Call us to set up your Appt today   301 690 2130