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DHD's high flow manifold bundle increases exhaust air flow over 55% without any port modifications. Additional gains can be found in port matching and port blending. Our manifolds are cast from the same high Silca Iron that's become standard in the high flow manifold market. Included in the high flo...

If your experiencing lopey, erratic idle rpm there's a good chance your FPR or the FPR jumper harness is at fault. This FPR service kit from DHD is a favorite amongst installers. DHD's kit includes everything needed to do the job correctly, the first time. Each kit includes a new OE Bosch fuel press...

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))**This product is ONLY designed for closed course racing where it is legal to do so. Any other use ...

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))**This product is ONLY designed for closed course racing where it is legal to do so. Any other use ...

Kit includes Gaskets and Hardware!Extended Length Up Pipe SetHigh Flow Manifolds RequiredThis extended length high flow up pipe set allows 53% greater flow than stock and is a designed to work with DHD or PPE high flow manifolds. Unlike factory parts, DHD's up pipe is manufa...

Kit includes Gaskets and Hardware!Stainless Duramax Up Pipe SetBest FIT! Best Value!NO COREThese full featured OEM length up pipes are an excellent value! These are brand new and include all the high flow, high quality features your looking for at half of new GM LB7 up-pipes.DHD has taken OEM replac...

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))**This product is ONLY designed for closed course racing where it is legal to do so. Any other use ...

DHD Built Performance Allison Transmission Valve BodyDHD's Turbo Tony valve body is assembled in house with the best parts in the industry. DHD's 17 years of experience building transmissions has really allowed them to hone in on exactly what products and services make the best performing Allison tr...

NEW Design, Steel DIN construction, Does not accept GM compartmental parts or OE switches. DHD 115-510 Dirty Alli-Locker 5-Speed Torque Converter Lockup SwitchThe DHD Dirty Alli-Locker torque converter lockup switch was designed to be an exact fix for the ever long pursuit of true lockup contro...

DHD 115-510U Dirty Alli-Locker 5-Speed Torque Converter Lockup SwitchThe DHD Dirty Alli-Locker torque converter lockup switch was designed to be an exact fix for the ever long pursuit of true lockup controller that will work 100% of the time. After countless troubles with different aftermarket kits ...

DHD 100-175 GM Allison Transfer Case Support Brace 2001-2007 Classic Body This support can keep your Allison four wheel drive housing from cracking in the event of a driveline vibration (bad u-joint, dented or bent driveshaft) or on high horsepower pickups. This brace is our super heavy duty vers...

This 261/263XHD transfer case rebuild kit is perfect for those whom want to tackle the job themselves. Aside from the hard parts, this kit includes everything you need to service your case. DHD's kit includes all the seals and bearings needed to rebuild your NP261XHD or NP263XHD.Kit Includes:FRONT O...

DHD 100-185 ZF6 Transmission Rear Housing Support 2001-2006 Classic (T-Case Brace) This support can keep your adapter housing from cracking in the event of a driveline vibration (bad u-joint, dented or bent driveshaft) or on high horsepower pickups. This brace is our standard unit that is powder ...

Limiting your front suspension compression is critical to pulling truck setup! Front suspension height effects weight transfer and hitch height. These competition GM IFS stops provide a high strength, adjustable limiter for your lower control arm. These are perfect for any class puller and a must ha...

THIS ITEM CANNOT BE EXPEDITED DUE TO SIZE!DHD 600-415 Front Truck Pulling Weight Bracket 2001-2010 Chevy GMC 2500HD TrucksDHD's front weight bracket will work on all 2001-2010 Chevy/GMC 2500/3500HD pickups. Their newest revision is JIG built and utilizes 2" .250" formed tubing, providing excellent s...

DHD drive shaft hoops are a direct bolt on kit that comes with everything you need to safely house your driveshaft. This is designed for trucks with 2 piece rear drive shafts. Vehicle Applications: 2001-2010 Chevrolet and GMC Classic Pickups This item is not available for expedited shipping ...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

DHD's stainless steel Duramax hot side pipe kit is the perfect upgrade for your weak and restrictive factory hot side pipe. Our pipe kit fits 2001-2010 Duramax trucks and is designed to mimic the factory tube routing and placement. This direct fit design makes it so no engine accessories, wheel line...

For over 3 years DHD's TORQ series fasteners have been setting the benchmark for quality, performance and value. Don't be fooled by inferior late arrivals to the fastener market. Replace your OE flexplate / flywheel bolts with these 8740 chromoly fasteners from DHD. Our bolts work perfect with St...

Interested in making your own removable weight bracket or box? DHD's 01-10 GM Frame Brackets will make it a whole lot easier! These are the same durable, easy to install brackets that we sell in their full front mount weight box package. Their latest revision has added steel in critical areas as wel...

This harness connects to the fuel pressure regulator on the CP3 and the engine harness. These harnesses are subject to extreme heat and are often targets for rodents.DHD always recommends replacing this complete harness section rather then doing wire repairs. High resistance repairs could lead to id...

Stabilize your serpentine belt under high load and high rpm with DHD's add-on belt idler kit. These kits require no belt changes and no modification to belt routing. Simple 1 bolt installation in a factory hole. Features: Increases Belt to Balancer Contact Bridges Gap in Belt Routing Ea...

Deck plate Duramax engines are proven winners in both power production and durability. Our 1" deck plates are manufactured in the USA with A36 hot formed steel. A robust steel resistant to warping with a tensile strength as high as 80,000psi. If your looking for the ultimate in Duramax durabili...

A must have upgrade for your Duramax puller! This fixed fan hub will eliminate your OE viscous fan clutch and increase your intercooler efficiency. Early testing shows considerable decreases in intake air temps and coolant temps, both of which equate to more power. Testing, fitment trials and data c...

Replace your cracked or damaged OE flex plate with this heavy duty option from DHD. These units are nearly twice as thick as OE and are engineered to handle up to 1500lb-ft or torque. DHD's heavy duty flex plates are a must for customers with aftermarket torque converters and built transmissions! A ...

Is your Allison transmission leaking fluid around the wiring harness connector? This could be caused by a few different flaws. A. Your internal harness is allowing fluid to pass the wiring terminals within the connector. B. The O-ring sealing the pass thought harness body to the transmission cas...

Help keep your rear differential running cool and clean with an upgraded differential cover from DHD. Our covers are Made in the USA from high-quality cast aluminum with the largest set of cast cooling fins in the industry. These covers are the perfect addition to your axle build. These HD covers in...

As peak horsepower and engine RPM's continue to climb, it's becoming more evident that the factory Duramax belt tensioner is not sufficient! DHD's manual tensioner package is a complete solution to eliminating belt slip and belt deflection under high rpm and high load. This two-piece kit eliminates ...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

We've spent the last year investing in tooling and staff to move all our hoop production in house. We have never been more confident in the fit, function and finish of our Driveshaft Hoop product line.  DHD's competition drive shaft hoops and blow shields are designed to keep you safe and mi...

DHD's Deluxe LLY Low Pressure Fuel Hose Kit includes all engine related fuel supply and return hoses for 2004.5-2005 LLY Duramax Diesel pickups. These molded hoses often crack and deteriorate over time leading to leaks and hard starting issues. If you find one hose is leaking its always best practic...

If your experiencing lopey, erratic idle rpm there's a good chance your FPR or the FPR jumper harness is at fault. This FPR service kit from DHD is a favorite amongst installers. DHD's kit includes everything needed to do the job correctly, the first time. Each kit includes a new OE Bosch fuel press...

Backordered until 3/6/2024 (Updated 2/6/2024) DHD's billet fitting thermostat housing to heater core line kit makes heater core plumbing a breeze. This kit includes their billet coolant supply fitting that replaces the OE steel EGR/heater core supply tube, a billet triple seal heater core quick c...

Replace your trucks brittle plastic crankcase vent assembly (GM 97357033) with these billet pieces from DHD. Converting your truck to billet fittings and AN hose will eliminate the oily leaks prevalent with the OE vent system. DHD valve cover fittings are machined out of a single piece of alumi...

Replace your trucks brittle plastic crankcase vent assembly (GM 97357033) with these billet pieces from DHD. Converting your truck to billet fittings and rubber hose will eliminate the oily leaks prevalent with the OE vent system. Works with PPE 114028000.DHD valve cover fittings are machined o...

The DHD 700-155B Super High Flow Fuel Block Upgrade kit eliminates the restrictive factory fuel test-port/fuel block and replaces it with DHD's high flow black anodized aluminum block. This kit is identical to their standard kit except the CP3 fuel supply hose is 1/2" diameter. This kit utilizes USA...

Replace your soft and spongy OE boot with this high performance 5 ply silicone boot from DHD. This boot connects the turbocharger compressor housing to the factory hot side pipe. These are generally amongst the first boots to rupture on trucks building moderate boost. An excellent, easy to install, ...

If your experiencing lopey, erratic idle rpm there's a good chance your FPR or the FPR jumper harness is at fault. This FPR service kit from DHD is a favorite amongst installers. DHD's kit includes everything needed to do the job correctly, the first time. Each kit includes a new OE Bosch fuel press...

This direct OE replacement jumper harness joins the fuel rail pressure sensor to the engine harness. These harnesses are subject to extreme heat and are often targets for rodents.DHD's improved harness is designed to replace your flimsy OE jumper. DHD's jumper features a full foil sleeve, larger gau...

DHD Built Performance Allison Transmission Valve Body DHD's Turbo Tony valve body is assembled in house with the best parts in the industry. DHD's 17 years of experience building transmissions has really allowed them to hone in on exactly what products and services make the best performing Alliso...

Reseal your leaking lower radiator hose connector with this kit from DHD. Their Viton O-rings and retaining ring will allow you to service your existing hose, rather then purchase new! GM uses 2 different o-ring size in the connect, we provide both to ensure you have the one you need.Fitment:2006-20...

DHD 100-180 GM Alllison Transfer Case Support Brace 2008-2010 New Body LMM This support can keep your Allison four wheel drive housing from cracking in the event of a driveline vibration (bad u-joint, dented or bent driveshaft) or on high horsepower pickups. This brace is our super heavy duty ver...

If your one of the 3% that experience a CP4 failure on your Duramax, its extremely important to replace not only your CP4, but also its counter parts.DHD's LML fuel system kit is one of the most comprehensive on the market! Unlike their competition, they include 3 additional high pressure and low pr...

DHD 100-190 GM Allison Transfer Case Support Brace 2011-2019 LML L5P 2500/3500 Trucks This support can help prevent your Allison extension housing from cracking in the event of a driveline vibration (bad u-joint, dented or bent driveshaft). This brace is a great addition to any pull, drag or week...