




The Kooks 1371H420 1-7/8" Header and Catted Connection Kit for the 2021-2024 Ford F-150 with the Coyote 5.0L 4V engine offers exceptional power gains, durability, and EPA-verified Kooks GREEN Cats for emissions compliance. Upgrade your truck’s performance with superior exhaust flow and long-lasting stainless steel construction.
Physical products may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed, it is non-refundable.
Digital Products, such as MPT Tunes and HP Tuners Credits, are not covered by this.
Please see our Refund Policy or contact an MPT Expert for more information.
MPT is proud to offer free shipping on most orders over $149.
Free Shipping applies only to the contiguous United States. Shipping and handling charges will apply to all orders outside the contiguous US, with the buyer being responsible for any duty fees or taxes their home country may charge to import goods.
With Free Shipping, we will choose the best shipping method for the order. We use all major carriers, including USPS, FedEx, UPS, and DHL.
Items not stocked at our location may incur additional lead-time or charges.
Please our Shipping Policy for more information.


Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986) is a California law that applies to all companies selling products in California. Proposition 65 requires warnings if a product contains any listed chemical present above very low levels that are known to cause cancer, birth defects or other reproductive harm. Proposition 65’s warning standards are among the most stringent in the world. Proposition 65 is not a product safety law, but rather a “right-to-know” law. Businesses are required to provide warnings to comply with Proposition 65. These warnings are required to be in place for all products offered for sale in California.
There are over 800 chemicals on the Proposition 65 list, which is administered by California's Office of Environmental Health Hazard Assessment (OEHHA), a part of the California Environmental Protection Agency. The list includes naturally occurring and man-made chemicals. Proposition 65 warnings can be seen for a wide variety of everyday consumer products, including Automotive Performance products, and warnings can be seen posted throughout California in a variety of establishments such as hotels, restaurants, automobile dealerships/repair shops, and retail stores just to name a few.
To comply with the requirements of Proposition 65, this warning is present on all products sold by MPT.
More detailed information can be found by going to:
https://www.p65warnings.ca.gov/
The Kooks 1371H420 1-7/8" Header and Catted Connection Kit for the 2021-2024 Ford F-150 with the Coyote 5.0L 4V engine is the ultimate solution for performance enthusiasts who demand the best in power, durability, and emissions compliance. Kooks has upgraded this kit to feature the highly durable and high-performance Kooks GREEN Cats, which are engineered to handle up to 750 RWHP. The GREEN Cats provide superior quality and long-lasting performance, making them an ideal choice for modern muscle vehicles. This header and catted connection kit delivers significant performance improvements while meeting the strictest EPA emissions standards, offering both power and peace of mind.
The installation of the Kooks 1371H420 Header and Catted Connection Kit is rated as moderate in difficulty. The process generally involves removing the factory exhaust components and installing the new headers and catalytic converters. With basic mechanical skills, installation can be completed in 4-6 hours. Professional installation is recommended for those unfamiliar with exhaust systems to ensure optimal performance and fitment.
For further information or to report any inaccuracies in the product description, please contact MPT Performance experts at (407) 636-7077 or via email.
MPT is proud to offer free shipping on most orders over $149.
Turnaround Times:
Special Considerations:
A Return Authorization Number is required for all returns. Please contact an MPT Expert to obtain an RA # before sending anything back to us for any reason.
MPT tuning charges and license fees are Non-Refundable. The sale is final when MPT has sent the tune file over email. This includes both new tune purchases and tune updates.
Products other than MPT tunes, digital products, and MPT decals may be returned within 30 days for any reason, provided that the product has not been installed and is in brand new, unused condition with the original packaging. Once a product has been installed it is non-refundable. We reserve the right to deny the return, should the product be received and it display signs of installation or unmentioned damage.
For vehicle programmers/tuners, the vehicle must be returned to stock if a program was installed. If a tuning device is returned and has not been returned to stock, a refund will not be issued, and your tuner will not be sent back without a shipping and handling fee.
The customer is responsible for all shipping charges incurred during the return process.
Amount Refunded:
•Returns post marked before 30 days from the date the item was received will be refunded the purchase price, minus a 25% restocking fee and the cost of shipping.
•After 30 days, all sales are Final.
•Shipping charges along with any package insurance are non-refundable. If your purchase was shipped with our Free Shipping option, the cost of the shipping will be subtracted from the total refund amount.
HP Tuners Credits are assigned to the HP Tuners product with the submitted serial number and cannot be transferred. Once you load a tune to your vehicle with the RTD, these credits are Non-Refundable.
Digital products and files that have no ability to be taken back physically, such as an SCT Tuner Unlock, are Non-Refundable.
nGauge Tune License Fee is included in your initial purchase of MPT tunes for the nGauge. This fee is factored into the price of the tunes and becomes Non-Refundable when the stock file has been emailed to MPT.
MPT Decals are Non-Refundable, once they have been received by the customer.
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2023 | Ford | F-150 | King Ranch |
| 2021-2023 | Ford | F-150 | Lariat |
| 2021-2023 | Ford | F-150 | Platinum |
| 2021-2023 | Ford | F-150 | SSV |
| 2023 | Ford | F-150 | Tremor |
| 2021-2023 | Ford | F-150 | XL |
| 2021-2023 | Ford | F-150 | XLT |
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I purchased the 87PRX tune for my truck 5 months ago, and recently became curious about the 93PRX and purchased it now as well. For comparison, stock to 87PRX was a way bigger transformation than 87PRX to 93PRX. Both are really awesome tunes, but I would guess the 87PRX gave me about 75% over stock of what the 93PRX did. IMO the 87PRX is the way to go if you're conscious of fuel prices like I am. I'm curious to see how the mpg of the two tunes will compare. The transmission tuning itself is worth the money, let alone the power gains! Thanks MPT for your great work and customer service!!
Great Customer service they answered every question i had i actually live local to their shop and I placed my order and was able to pick it up within a couple hours and the tune for the 5.0 really brought it to life i did a 1,000 mile trip 2 days after Installing it and what a difference in fuel mileage it gave me that's definitely not the reason I bought it 😀 the tune also got the transmission shifting under control no more hunting for gears or skipping gears im happy i went with MPT!!!!
mpt is hands down the best company i know for tuning .. if its power you want its there/towing/fuel economy.. from first start to first drive you will understand why i would say that and you would agree. I have had several vehicles tuned by mpt and the drivability is so refined from shifting to acceleration and deceleration and a smooth idle is key and there tech support is aways on point if there any trouble shooting , from sales to tech to the calibration ther hands down a 5 star company .. first tune no revision yet 11.91 speaks for its self / tune only e50 Pr-x .. stock best 12.96 before tuning
mpt is hands down the best company i know for tuning .. if its power you want its there/towing/fuel economy.. from first start to first drive you will understand why i would say that and you would agree. I have had several vehicles tuned by mpt and the drivability is so refined from shifting to acceleration and deceleration and a smooth idle is key and there tech support is aways on point if there any trouble shooting , from sales to tech to the calibration ther hands down a 5 star company .. first tune no revision yet 11.91 speaks for its self / tune only
By far the best tuning I’ve ever experienced. Truck absolutely came alive after MPT tuning and the transmission shifts so much smoother than stock.