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AMS Performance Alpha Series Downpipes with Cats Mercedes-Benz E63 AMG 5.5L Biturbo 4-Matic 14-15 RACE USE ONLY


AMS Performance

Model #ALP.12.05.0004-1

Shopper Award

This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles.

Purchasing this product requires you to sign our Vehicle Compliance Waiver here.

The Alpha Series Mercedes-Benz 5.5L BiTurbo Downpipes for your E63/CLS63 AMG are the ultimate solution for improving power, throttle response and exhaust note without sacrificing quality, fitment or design. If you are looking for the highest quality downpipes for your M157 engine, look no further!

Each Alpha BiTurbo Downpipe runs 3" (76mm) tubing for optimum flow all the way to your factory or aftermarket cat-back exhaust. Competitors chose to mimic the factory passenger side piping where it necks down at the connection creating turbulence and hurting exhaust flow and power. This is a more cost effective way to make the system connect to the cat-back portion of the exhaust, but it hurts flow by creating a bottle neck. This was not a compromise we were willing to make so AMS's engineering team implemented a ball-joint style connection retaining a full 3" diameter maximizing your power gains. On their test vehicle +30HP and +35ft-lbs were seen on the Race version!

These BiTurbo downpipes aren't something AMS quickly whipped up in a fabrication shop. These are properly designed and engineered using a CMM laser scanner for a perfect fit and space optimization. By choosing a 3 piece design they have provided improved adjustability and fitment making them easy to install. Placement of each O2 sensor bung was carefully chosen, eliminating the need to extend factory 02 sensor wiring. All brackets mount to their stock locations and each downpipe is routed in such a way that you DO NOT need to remove the factory heat shielding. All designed for a clean and proper OEM-like installation! When you choose AMS's Alpha Series Downpipes, there is no need to hack up your prized possession.

Another unique benefit is AMS's GESi racing catalytic converter option. These 300 cell count units provide virtually no disruption in flow and feature a staked in design to hold the catalyst firmly in place. Many competitors offer a low quality converter option to keep the cost low and profits high. Often these units fail due to poor construction and inferior materials. When you choose Alpha you will remain emissions compliant and worry free for years to come.

  • Big increases in power throughout the entire power band
  • 3" (76mm) piping all the way through to the cat-back connection
  • +30HP and +35ft-lbs gain over stock downpipes (non-catted)
  • +15HP and +15ft-lbs gain over stock (catted)
  • Improved turbo & throttle response
  • Eliminate turbo lag
  • Exotic exhaust note
  • 3 piece design for precise and proper fitment
  • Retains factory heat shielding
  • Mates up to stock and aftermarket exhaust systems
  • Unrivaled fit and finish
  • Includes ALL necessary parts and hardware for installation
  • 100% low carbon 304 Stainless Steel construction
  • Mercedes-Benz E63 AMG 5.5L Biturbo 4-Matic 14-15
Vehicle Engine Notes
Mercedes-Benz E63 AMG

AMS Performance builds serious performance products for cars such as the Mitsubishi EVO, Nissan GTR, Subaru Impreza, and Porsche 911. Their background in drag racing allows them to build turbo kits, engines, manifolds, and other parts to take the punishment of what 1000+ horsepower cars produce. AMS focuses on these racing parts and kits to give the customer a complete package of power.

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