Fabspeed HJS Sport Catalysts for McLaren P1

Replace the P1 factory catalyst sections with the model-specific HJS assemblies. This listing covers the catalyst hardware, which must be checked against the car’s turbo, sensors and downstream exhaust. Fabspeed Motorsport, based in Fort Washington, Pennsylvania, develops exhaust systems, air intakes and ECU tuning for sports cars including Porsche. Its development work uses dynamometer testing, road evaluation and racetrack testing.

Technical Details

• Manufacturer product reference: FS.MCL.P1.SC.
• HJS high-flow catalyst construction with T304L stainless assemblies.
• Application-specific replacement for McLaren P1.
• Rear exhaust and ECU calibration are separate unless explicitly ordered.
• No universal power, fault-light or road-certification guarantee is made.
• Covered by the Fabspeed Lifetime Warranty, subject to its terms and exclusions.

Use restrictions

Confirm certification and permitted use for the exact application; a manufacturer no-check-engine-light claim is not public-road approval.

Manufacturer Videos

What Are HJS Catalytic Converters? | Fabspeed Motorsport

Demonstration vehicles may have additional modifications. The selected product configuration determines what is supplied; a video does not establish fitment or guarantee a particular sound or output.

Need help matching this part? PMB Performance brings over 20 years of parts and fitment experience. Send your VIN and the relevant original or modified component details so we can help verify the application before you order.

Fitment & Compatibility