PG's High-Flow Catless Downpipes for BMW S68 M5 G90 / G99 and 7 Series G70 / G73

Upgrade your BMW S68 twin-turbo V8 platform with Gamma high-flow catless downpipes, engineered for improved exhaust flow, reduced backpressure, faster turbo response, and increased performance.

Constructed from premium 304 stainless steel, these downpipes are built for long-term durability, corrosion resistance, and high-temperature performance. Each set features precision CNC-machined V-band connections and flanges for secure fitment, proper sealing, and reliable installation.

Unlike many restrictive factory-style designs, Gamma downpipes are designed with a smooth 3D-bent flow path to help maintain strong exhaust velocity from the turbo outlet through the exhaust system. This helps improve turbo efficiency, sharpen throttle response, reduce lag, and support increased horsepower and torque when paired with the proper ECU tune.

Compatible Fitment:

BMW M5 G90 Sedan — S68 Twin-Turbo V8
BMW M5 G99 Touring — S68 Twin-Turbo V8
BMW 7 Series G70 — 07/2021 to 03/2025
BMW 7 Series G73 — 11/2021 to 02/2025

Key Features:

High-flow catless design for maximum exhaust flow
Premium 304 stainless steel construction
Precision CNC-machined V-band connections and flanges
TIG-welded for strength and durability
Smooth 3D-bent piping for improved exhaust velocity
Reduced backpressure compared to factory downpipes
Improved turbo spool and throttle response
Aggressive performance exhaust tone
Designed for tuned S68 twin-turbo V8 applications

Important Notes:

Our Custom HCP ECU tuning is required for proper performance and to help prevent check engine light issues. These are high-flow catless downpipes intended for off-road or track use only where permitted by law.

G90/G99