Alpha Series 5.5L BiTurbo Downpipes

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Now available! The Mercedes-Benz 5.5L BiTurbo Alpha Series Downpipes for your 2012-2013 or 2014+ 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!

Designed To Out Flow The Competition

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 in the system.  This is not a compromise they were willing to make so their Engineering team implemented a ball-joint style connection retaining a full 3″ diameter maximizing your power gains.  On the test vehicle +30HP and +35ft-lbs were seen on the cat-less version!

Unparalleled Fitment Through Proper Engineering

These BiTurbo downpipes aren’t something 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've 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 the Alpha Series Downpipes, there is no need to hack up your prized possession.

The Difference Is In The Details

Another unique benefit is the GESi racing catalytic converter option.  These 300 cell count units provide nearly 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.

Exclusive Benefits

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
Premium race catalytic converters
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
3″ (76mm) piping with .065″ wall thickness
300 cell race catalytic converter (optional)


For CA Proposition 65 Warning: Click Here

More Information
BrandAlpha Performance
Filter by Type of PartDownpipes
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