Maximize Power, Reliability, and Efficiency for Your Build

Whether you are squeezing every ounce of horsepower out of a gas V8 or bulletproofing a heavy-duty diesel workhorse, the mechanical heart of your rig demands premium components. At Built Not Bought Parts Source, our Engine & Underhood Performance collection delivers the highest quality aftermarket upgrades for your powertrain. From high-flow air intakes and free-flowing exhaust systems to advanced forced induction kits and critical cooling components, we stock the parts required to maximize your horsepower, torque, and engine longevity.

Engine & Underhood Performance Contains:

• Air Intake Systems
• Exhaust, Mufflers, and Tips
• Programmers and Chips
• Forced Induction
• Engine Components
• Fuel Delivery
• Cooling
• Ignition
• Oils and Oil Filters

Ready to unlock your engine's true potential? Select a category to find the exact performance parts engineered for your specific application.