MagnaFlow 17878 Custom Builder Pipe Kit Diesel 4in. Turbo-Back Exhaust System

The MagnaFlow 17878 Custom Builder Pipe Series Turbo-Back Exhaust is a weight-optimized, emissions-legal diesel exhaust kit engineered to deliver dyno-proven performance gains and MagnaFlow's signature aggressive sound profile. Built from mandrel-bent pipes, this kit gives diesel truck owners a professional-grade foundation for a fully customized turbo-back exhaust setup.

Constructed entirely of corrosion-resistant stainless steel using CNC precision robotic manufacturing techniques, the 17878 is built to last and backed by MagnaFlow's limited lifetime warranty. The 4-inch diameter mandrel-bent piping is tuned to produce aggressive interior and very aggressive exterior sound levels, making it a top choice for performance-oriented diesel builds.

Key Features:

• 4-inch diameter stainless steel mandrel-bent piping for maximum exhaust flow
• Turbo-back design routes exhaust from the turbocharger all the way to the tail pipe
• Single passenger-side rear exit termination
• Emissions-legal, weight-optimized construction
• CNC precision robotic manufacturing for consistent fitment and quality
• Clamp-on inlet type with band clamp and U-bolt clamp hardware included
• Hangers included; no catalytic converter, muffler, or exhaust tip included
• Corrosion-resistant stainless steel construction
• Backed by MagnaFlow's limited lifetime warranty

The Custom Builder Pipe Kit is designed as a pipe-only exhaust system, giving builders the flexibility to add a muffler, catalytic converter, or exhaust tip of their choice. Whether building an all-out race truck or a spirited street-driven diesel, the 17878 provides the high-quality piping foundation every custom exhaust starts with. Professional installation is recommended, as cutting, welding, and fabrication may be required.