RK Autowerks developed air intakes for the AMG M157 5.5 liter twin turbo V8 under the hood of the C218 CLS63 AMG. Presumably, these can be adapted to the W212 E63 AMG which share the same M157 5.5 liter V8 as well.


The intake is a point of a restriction on the M157/M278 engine design with tuners showing some large gains. RK Autowerks claims an increase of ~22 whp but no dyno is provided.

Even so with intakes you need real world air flow to really show what they can do and dyno fans are often inadequate in that respect.

If you are looking to maximize the efficiency of your AMG bi-turbo V8, definitely look into a good intake setup.

Part number: RKCLS63AMGi
Performance Gains: 22WHP/12WTQ SAE
Installation time : 5-6 hours

• 20-30+ HP gains
• 30% increase in intake tubing size
• 30% increase in turbo inlet tubing
• Unobstructed air inlet allowing cool air from the front of the car to reach the engine
• 100% pre-preg carbon fiber to reduce heat soak and prolong intake longevity
• CNC machined molds ensuring fitment is perfect
• Necessary hose clamps, couplers, hoses, and fittings included