Custom 300 Cell Catted Downpipe Header System for Mercedes‑Benz E63 E63S AMG GT C 4.0TT

Unlock maximum performance from your 4.0L Twin‑Turbo AMG platform with the STRATEC Custom High‑Flow Catted Downpipe & Header System, available in 100‑cell, 200‑cell, or 300‑cell catalytic configurations to match your performance goals.

Engineered for the M177 / M178 4.0TT V8 found in the E63, E63S, AMG GT, and GT‑C models, this system replaces restrictive factory exhaust sections to dramatically improve exhaust flow, turbo efficiency, and throttle response. The optimized header and downpipe design enhances exhaust scavenging, helping deliver stronger mid‑range torque and improved top‑end power.

Precision fabricated from high‑grade stainless steel with mandrel‑bent tubing and TIG‑welded construction, the STRATEC system is built for durability under extreme heat and performance driving conditions.

Catalyst Options

100‑Cell (Race‑Focused)

• Maximum exhaust flow

• Fastest turbo spool

• Loudest, most aggressive exhaust tone

• Intended for high‑performance builds

200‑Cell (Performance Street Setup)

• Significant flow improvement over stock

• Aggressive tone with balanced drivability

• Ideal for tuned street applications

300‑Cell (Refined Performance Upgrade)

• Improved flow while maintaining smoother tone

• Best suited for daily‑driven performance vehicles

• More refined sound profile

Performance Benefits

• Reduced backpressure for improved turbo efficiency

• Faster turbo response

• Increased mid‑range torque and top‑end power

• Enhanced AMG V8 exhaust character

• High‑strength stainless steel construction

• Precision TIG welded fabrication

• Direct bolt‑on installation

Fitment

Mercedes‑Benz E63 AMG W213 – 4.0TT V8
Mercedes‑Benz E63S AMG W213 – 4.0TT V8
Mercedes‑AMG GT – 4.0TT V8
Mercedes‑AMG GT‑C – 4.0TT V8
Model Years 2014–2022