Fabspeed HJS Sport Cat Downpipes for Mercedes-AMG E63 S / GT63

Change the matching M177-powered E63 S wagon or GT63 downpipe assemblies with Fabspeed’s HJS 200-cell sport-catalyst system. Exact chassis and exhaust layout control compatibility; the unrelated AMG GT two-door wording does not establish fitment. Based in Fort Washington, Pennsylvania, Fabspeed Motorsport designs exhaust, intake and ECU-tuning products for Porsche and other sports cars. Development includes evaluation on a dynamometer, on the road and at the racetrack.

Technical Details

• Manufacturer product reference: FS.MER.M177.SC.
• HJS German tri-metallic 200-cell catalyst cores.
• Mandrel-bent T304L stainless downpipes.
• For the corresponding M177 original downpipe connections.
• Manufacturer guide requires cutting the original downpipes for removal to avoid dropping the transmission. The replacement assemblies use their specified clamps and joints; professional installation is recommended.
• Confirm sensors, heat protection and vehicle-market requirements.
• Do not extend coverage to hybrid GT63, other engines or two-door AMG GT by badge alone.
• Covered by the Fabspeed Lifetime Warranty, subject to its terms and exclusions.

Use restrictions

Retain required emissions equipment and confirm the exact vehicle market and installation requirements. Catalyst or filter changes require application-specific approval; no universal road legality or fault-light guarantee is implied.

Installation Resources

• Manufacturer installation document (PDF)

With over 20 years of parts experience, PMB Performance can help check the application. Share your VIN and photos or references for the component being replaced before ordering if the match is uncertain.

Fitment & Compatibility

Use the application details below together with the original component and any existing modifications.