Presenting SPD’s GEN 4 Raptor downpipes. Why GEN 4?? Ford made a few significant changes to the 2024-2025 Raptor 3.5L Ecoboost Engines.  These engines do not have exhaust manifolds, and the turbos are bolted directly to the heads. Ford first did this on the 2.7L and 3.0L Ecoboost engines.

Our Industry First Alpha Cats provide ultra-high flow while meeting green emission standards.  Factory GEN4 Raptor downpipes are very restrictive because Ford reduces the diameter of their primary cats from 5.5″ to 5″. This reduction in diameter ( -5 square inches of surface area) causes higher back pressure and EGTs.  With SPD Alpha ultra high flow cats and larger 3″ diameter mandrel bent tubing, you will improve throttle response, mileage, and overall performance while reducing turbo lag and exhaust temperatures. Our turbo flanges are CNC laser cut 1/2″ 304ss flanges, and we TIG & MIG weld the downpipes for strength and durability. We designed a 4″ flex pipe to absorb shock from engine movement and chassis flex.  Our downpipes do not require custom tuning and can be used as a factory downpipe replacement. Our catalytic converters are made in the USA and are designed to be used in racing applications.

SPD Alpha Cats

SPD Alpha Cats are next-generation ultra high-flow green emissions catalytic convertors and are an industry first.  We needed a catalytic convertor that would have high flow and green emissions. Every catalytic converter we tested in the industry had green emissions or high flow but not both.  SPD Alpha Cat is a 500-cell catalytic convertor and will outflow our previous 400-cell performance cats by +90%. They are extra loaded with Rhodium, a platinum-based alloy required in a catalytic converter to reduce NOX in the exhaust to meet the new emission standards.

On all SPD Performance 304 stainless catted downpipes, you get:

• Increase in performance
• Improved turbo spool time
• Better fuel mileage
• Direct turbo bolt-on design
• NO CEL – Ultra High Flow 500Cell catalytic converters that do not cause check engine lights
• 304 Stainless Steel 3″ mandrel bent tubing
• High-grade v-band clamp for a solid seal and no leaks

We use EPA-approved federal catalytic converters, but you are responsible for verifying that they are legal with your state and county laws.

We will NOT ship this product to California.

First Class Customer Service & Satisfaction.

At Function Factory Performance, customer service is our top priority. We know that finding the right parts can be overwhelming, so we’re here to make the process smooth and enjoyable. We’re always ahead of the curve with our commitment to education and awareness. Let’s make this experience simple and awesome together! Don’t hesitate to call us at (480) 576-8606 or click here to reach us via email.

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