Performance Pack




AMG GT SERIES DOWNPIPES AND ECU RECALIBRATION Unlock your vehicles true power and performance potential with Exhaust Nations M178 aftermarket downpipes and ECU recalibration for the very special 2015+ AMG...


Unlock your vehicles true power and performance potential with Exhaust Nations M178 aftermarket downpipes and ECU recalibration for the very special 2015+ AMG GT vehicle range. The downpipes improve performance by reducing turbo lag, reducing back pressure and greatly enhancing the exhaust note. EXHAUST NATION worked with the world’s top ECU recalibration software engineers to deliver a safe and effective upgrade to your vehicles engine management system without any risk.

Note: More aggressive custom software packages are available on request.

Fabspeed Lamborghini Urus Sport Catalytic Converters replace the restrictive factory cats with high-performance German-imported 200-cell HJS sport catalytic converters for significantly improved performance and exotic car sound. HJS Sport Cats are extremely efficient in terms of air flow, flowing at 93 - 95% the rate of a straight pipe. We are utilizing bullet proof, high flow HJS catalysts to ensure durability and longevity for the life of the product while eliminating chances of a check engine light. Fabspeed Motorsport invested a lot of time and resources into developing the best possible downpipes and we're now proud to offer you this latest and greatest solution. Lamborghini is constantly updating and revolutionizing their vehicles and offering even better performance, and we're dedicated to doing the same. Fabspeed Motorsport is the world's authority for aftermarket Lamborghini performance.


2015+ Mercedes AMG GT/GT-S/GT-C/GT-R/GT 4 Door Coupe fitted with the mighty M178 4.0 twin-turbo engine


  • Full 3” inner diameter
  • Manufactured with high-quality 304 stainless steel
  • 100% OEM fit with oxygen sensors placed in OEM locations
  • 10lbs lighter than OEM units
  • Massive Increased HP and Torque gains when with packaged with our M178 ECU recalibration software
  • Reduced turbo lag and better throttle response with significantly improved exhaust flow
  • Catless or 200cpsi Euro 5 spec high flow cat options available.
  • Aggressive exhaust note with catless options, catted version are louder than OEM but not significantly more.


  • Improved Throttle Response
  • Re-calibrated settings for a smoother part throttle transition
  • Re-calibrated settings for a smoother and more linear power delivery
  • Raised RPM thresholds (where applicable)
  • Increased Boost levels (where applicable)
  • Re-calibrations for end user’s available premium fuel (91/93oct. or 100oct)
  • Off road only/track use tunes available.
  • Top Speed Limiter removal
  • Exhaust burble & “pops” (where applicable)

THESE PARTS ARE LEGAL FOR USE ONLY IN COMPETITION RACING VEHICLES AS DEFINED UNDER CALIFORNIA LAW, AND ARE NOT LEGAL FOR USE IN ANY OTHER MOTOR VEHICLE. California law defines a "racing vehicle" as "a competition vehicle not used on public highways." (Calif. Health & Safety Code 39048) These parts may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event. Competition-only motor vehicles may not be driven to a racing event on a public highway and must be transported on a trailer or other carrier. USE OF THESE PARTS IN ANY OTHER VEHICLE MAY SUBJECT YOU TO FINES AND PENALTIES FOR VIOLATION OF FEDERAL AND/OR STATE LAW, WILL VOID YOUR WARRANTY FROM EXHAUST NATION, LLC., AND CAN VOID YOUR VEHICLE'S WARRANTY. It is your responsibility to comply with all applicable federal and state laws relating to use of these parts, and Exhaust Nation, LLC. hereby disclaims any liability resulting from the failure to use these parts in compliance with all applicable federal and state laws.

HJS German imported catalytic converters are made from some of the highest grade materials you can find in a catalytic converter. This yields high performance gains and longevity so it wont deteriorate over time like lower grade catalytic converters. These catalytic converters flow up to 93-95% of a straight pipe in most applications. The benefit is that you get the "straight pipe sound" while still being able to provide enough emissions scrubbing to prevent a check engine light.
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