MBRP GMCA425 3 Inch Turbo Down Pipe CARB Compliant for Duramax

The MBRP GMCA425 is a high-performance 3-inch turbo downpipe engineered specifically for 2001-2004 Chevrolet Silverado and GMC Sierra 2500/3500 trucks equipped with the 6.6L Duramax diesel engine. This CARB-compliant downpipe (EO# D-763-2) is legal for use in all 50 states, making it an ideal choice for diesel enthusiasts who want improved exhaust flow without sacrificing emissions compliance.

Constructed from heavy-gauge aluminized steel with a durable black powder coating, this downpipe reduces exhaust backpressure and allows your Duramax engine to breathe more freely. The mandrel-bent tubing ensures smooth, unrestricted flow with no crimping or rippling in the bends, maximizing exhaust velocity and helping your turbocharger spool more efficiently. The result is improved throttle response, better fuel economy, and enhanced overall performance.

Key Features:

• 3-inch mandrel-bent aluminized steel construction for maximum flow
• Black powder-coated finish for corrosion resistance and aggressive styling
• CARB Executive Order #D-763-2 compliant for legal use in all states
• Bolt-on installation for straightforward fitment
• Enhanced exhaust flow reduces turbo lag and backpressure
• Designed specifically for early 2004 and older Duramax applications

This downpipe is backed by MBRP's quality warranty and represents a proven upgrade for LB7 Duramax owners looking to unlock additional performance while maintaining emissions compliance. The black coating provides excellent appearance and protection in dry to moderate climates.