What is the difference between Extrude Hone, EDM, and AFM?
Electro Discharge Machining is a process where an electrically charged wire burns a hole through metal. Bosch uses EDM to create nozzles, but on a very advanced machine that controls the angle and speed of the wire insertion. The angle of insertion is very important to keep correct or the spay angle will be changed, resulting in possible engine damage. When Bosch changes the speed of insertion they can achieve a cone shaped hole that will improve atomization. EDM’s used in the aftermarket are usually decommissioned medical instruments that do not have the ability to control either angle or speed precisely enough to create a quality product. Electro Discharge Machining that is done by Bosch is followed by Abrasive Flow Machining, to clean up any imperfections, remove burn residual and balance injector flow. Aftermarket EDMing does not use AFM to balance flow, or clean up any imperfections. DDP Injectors use Extrude Hone Technology. We start with an EDM’d nozzle with the correct spray angle, and finish Hone them to remove imperfections, polish the inside of the nozzle, and radius the inside of the holes where the fuel flows. This leads to better atomization, which provides less smoke and heat, and more power and mileage. Adding volume without helping atomization only adds heat and smoke, which means less useable power.

Why hone each nozzle separately?
DDP Hones each nozzle separately and balances their flow to better than factory specs to create a smooth idle, and smoother running truck. Stock injector nozzles from Bosch are usually within 2 to 3 liters per minute on a flow test machine. When any set of nozzles leaves DDP, it will be within 1 liter per minute.

Will Extrude honed nozzles void my warranty?
Very few dealership techs would be able to detect DDP Extrude Honed Injectors. Electronic boxes can leave codes in your truck that indicate their past presence, leaving you without a warranty. This only applies to stock nozzles. Any Jammer, or 275 nozzles found on 98.5-2002 Cummins are easily detected.

What else should I buy with injectors?
All trucks that receive injectors should have at minimum, a pyrometer installed to monitor exhaust gas temperature.

What if I want a custom horsepower level?
DDP, can hone custom nozzles for “race only” applications, or a custom horsepower. A custom injector order form must be signed by the end user stating that they are aware of the risks, and lack of warranty.

What kind of warranty does DDP offer?
Our Injectors are warranted for 3 years from the date of purchase. This covers product failure, but not abuse. DDP will not warrant any injectors that fail due to poor fuel use, or aftermarket pressure boxes, that crack nozzles. Additionally we offer a 30 day money back guarantee to any customer that is not happy with our product.

I have an Edge box, a TST box, and a Dr Performance box stacked, will I still get the advertised horsepower level?
No, not necessarily. Our injector testing is based upon stock trucks. Some trucks will respond fine to the stacking and injectors, and others will not gain the advertised horsepower level. In this case I would consider removing one or more of your unreliable electronic boxes, to get the full horsepower gain and reliability that a set of DDP injectors can provide. Additionally, if you add a set of injectors, and do not get the advertised gain, make sure that you have enough air to burn the fuel that you are trying to cram into the motor. Just because it was on TV does not mean that it will work correctly with a stock turbo, exhaust, and no air box.

What is drive pressure, and how will it affect my truck?
Drive pressure is the amount of PSI between the exhaust valves, and the turbine wheel on the turbo. Boost is the amount of PSI between the intake valves, and the compressor wheel. If the drive pressure is higher than the boost, you have what is called Negative Delta. Negative Delta can ruin head gaskets, other engine components, and actually slow you down in the upper RPM’s. If the drive pressure is higher than the boost pressure, a smaller amount of fuel, or a larger amount of air is needed.