Company - About 

Diesels are all about Attitude!

Our mission at Attitude Performance Products is to provide superior parts made of the highest quality materials available. We do not compromise; we provide the best products in the industry. Stronger, faster, better.  Attitude gives authority to your engine!

We LOVE Diesels and want to enhance the excitement for the diesel enthusiast by providing performance products from delivery valve holders, to fuel rail plugs of all types, to freeze plugs, to rack caps. These items enable the user to modify their engines for fuel control, optimum power, increased fuel economy, increased power, lower EGT’s, higher boost, longer engine life, and many other facets of Diesel engine enhancement.

Attitude Performance Products takes pride in promoting internal research and development, tested and proven by external sources. Our design solutions bring new excitement for diesel enthusiasts. With the rise of high-performance engines, APP’s contributions to the industry will help you stay ahead of the competition. Our recent additions to the product line are new to the industry:  The Adjuster mechanical chip which provides full fuel control of the 12-valve Cummins—or any engine equipped with a Bosch P7100 Injection Pump; the Billet Aluminum oil squirters for the Cummins that lubricates the piston and replaces plastic squirters that are prone to fail; and the Saddle Jet Plugs for the ’03 to current Cummins.

Attitude is focused on quality. Stated very simply, it improves reliability. Our products are Made in America from the finest materials with the finest workmanship.

Made in the USA

A word of caution before attempting any performance modification:

A word of caution before attempting any performance modification:It is the sole responsibility of the purchaser and/or installer of any APP part to employ the correct installation techniques required to ensure the proper operation of the part. APP offers the highest quality performance parts; however, APP holds no liability for any part failure due to improper installation or use. Some APP parts are sold for off-road/racing/hauling only. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. APP offers no certification regarding pollution controlled devices or mandated emissions requirements. Performance products are legal in California only in certain strict circumstances. There is no instance where APP, it’s officers, members, employees, agents, representatives, and/or volunteers are liable for any damages, personal or mechanical, whatsoever.


Engine Blocks are manufactured/cast at many locations nationally and internationally.  Please be aware there can be slight variations in orifices/specs for these engine blocks. While APP’s parts are manufactured to the optimum efficiencies, if engine mounts are slightly different than the standard precise specs, there could be some deviation in fitment.