Diesel & Delete Kit Questions
What is the DPF/DEF and why should I delete it?
The Diesel Particulate Filter (DPF) traps soot and particulates in your exhaust. Over time, the filter clogs and forces your truck into âregen mode,â burning extra fuel and reducing power. Eventually, it can cause major engine issues.
A DPF delete pipe removes this restriction, restoring horsepower, turbo spool, and fuel efficiency. Pairing the pipe with a delete tuner ensures your truckâs computer runs properly without the DPF.
What are the risks of removing my emissions equipment?
In the United States, deleting your DPF, EGR, or DEF is not legal for street use and is intended for closed-course, off-road, or race applications only. Fines may apply if driven on public roads.
If youâre outside of these regions, you may not have restrictions â check local laws before making modifications.
Always ensure hardware deletes are paired with a tuner. Running your truck with parts removed but no tuning will result in limp mode or engine damage.
What is the EGR and why should I delete it?
The Exhaust Gas Recirculation (EGR) system routes exhaust gases back into your intake. While designed to reduce emissions, it often clogs your intake with soot, increases engine temps, and reduces efficiency.
An EGR delete removes this problem, improving throttle response, fuel economy, and long-term reliability. Like the DPF delete, it requires a tuner to recalibrate your ECU.
I drive a [Year/Make/Model], what delete options do I have?
Use our Year/Make/Model dropdown menu in the header or product page. Youâll see all compatible tuners, DPF delete pipes, and EGR kits for your truck.
Each option includes a product description to help you decide. Some tuners cost more due to brand, features, or ease of use, but all are fully delete-compatible.
Tuning & Installation Questions
Do I need a tuner for my delete kit?
Yes â a tuner is required for any DPF, EGR, or DEF delete. Once you remove or bypass emissions components, your truckâs factory computer no longer recognizes key systems and will trigger error codes or go into limp mode.
A delete tuner (also called a âdelete tuneâ) recalibrates your ECM so it runs properly without those emissions controls. It adjusts fuel mapping, timing, and sensors for optimal performance and reliability.
Without a tuner, your truck will not operate correctly after a delete.
Can I install delete parts and Holley upgrades myself?
Many enthusiasts do, but it depends on your experience level and the parts youâre installing:
- DPF/EGR delete kits usually require basic mechanical tools and some exhaust or intake disassembly.
- Tuners/programmers are plug-and-play but must be configured carefully with your VIN and calibration.
- Holley upgrades (intakes, throttle bodies, EFI systems) are often bolt-on and come with detailed instructions.
If youâre confident with mechanical work, you can complete most installs at home. However, professional installation is recommended for complex builds, custom tuning, or wiring-intensive setups.
What is the difference between a tuner and a programmer?
These terms are often used interchangeably, but hereâs the difference:
- A tuner generally refers to the software or device used to modify your truckâs engine calibration.
- A programmer is the hardware that connects to your OBD-II port to flash that new tune into the vehicle.
Most modern devices â like the Mini Maxx V2 or EFI Live AutoCal â act as both a tuner and programmer, allowing you to load custom delete tunes and make real-time adjustments such as tire size, speed limiter, or shift points.
What happens if I donât install a delete tune?
Running your truck with deleted components and no tune can cause serious issues. The factory ECM will detect missing emissions sensors and trigger limp mode, check-engine lights, or derate power.
In some cases, the engine may run too rich or lean, damaging injectors, turbo, or exhaust sensors. A proper delete tune disables those emissions checks, optimizes fuel and air delivery, and keeps the engine running safely and efficiently.
Never remove emissions equipment without tuning the ECM to match the hardware changes.
Holley Performance Parts Questions
Why choose Holley intakes and throttle bodies?
Holley has been a leader in performance for decades. Their intake manifolds, throttle bodies, and EFI systems are designed for maximum airflow and fuel delivery â meaning more horsepower and torque across the RPM range.
Compared to stock, Holley parts are tuned for performance, whether youâre building a street machine, drag car, or off-road setup.
Will Holley parts fit my vehicle?
Most Holley performance parts are application-specific. Always check the product description for compatibility with your engine family, year, and model. If youâre unsure, contact us and weâll help match the right Holley intake, fuel system, or accessory to your build.
Do Holley parts improve horsepower?
Yes â Holley intakes, throttle bodies, carburetors, and EFI systems are designed to increase airflow and optimize fuel delivery. Gains vary by application, but most customers see improvements in horsepower, throttle response, and drivability.
Are Holley parts emissions legal?
Some Holley parts carry CARB E.O. numbers and are legal for street use in California and other states following CARB rules. Others are designed for race/off-road applications only.
Always check the product details for emissions status before ordering.
Account, Ordering, Shipping & Warranty
Do I need to open an account in order to shop with you?
No, you donât need to. You can make purchases and check out as a guest everytime.
However, by setting up an account with us, it will allow you to order without having to enter your details every time you shop with us. You can sign up right now, or you can first start shopping and create your account before you check out at the shopping cart page.
How do I order?
Shop for the items you want and add it to your shopping cart. When you have finished, you can proceed to your shopping cart and check out. Check and ensure that all information is correct before confirming your purchases and payment.
Can I amend and cancel my order?
Unfortunately we are unable to cancel an order once it has been placed. This will allow us to pack your orders efficiently and to minimize errors. It is advisable to check your order before placing it.
How will I know if my order is confirmed?
After you have placed your order, you will receive an acknowledgement e-mail from us to confirm that your orders have been received. However, do note that orders will only be shipped when your credit card payment has been approved and billing and delivery address is verified. Alternatively, you may check the status of your order in âMy Accountâ if you are a registered user.
How do I /create an account?
Please click on âLogin/Registerâ followed by âCreate An Accountâ and fill in your personal particulars.
How do I pay for my orders?
We accept payments via Paypal and all major credit and debit cards such as Mastercard, VISA and American Express.
I have a discount code, how can I use it?
Unfortunately we are unable to cancel an order once it has been placed. This will allow us to pack your orders efficiently and to minimize errors. It is advisable to check your order before placing it.
I have problems adding items to my shopping cart?
You will be able to add the items as long as it is available. There could be an instance where the item is in someone elseâs shopping cart hence the status of the items is reflected as âTemporarily Unavailableâ.