4" Stainless Down Pipe Back Exhaust – No Muffler – Ram 6.7L Cummins (MEL412029-SS890NM)

Mel’s Manufacturing 4" Stainless Down Pipe Back Exhaust – No Muffler – Ram 6.7L Cummins (MEL412029-SS890NM)

This Mel’s 4" T409 stainless down pipe back system replaces the stock exhaust on 2019+ Ram 2500/3500 6.7L Cummins trucks with a mandrel-bent flex-pipe-back kit. It’s a single 4" race system with no muffler or tip, designed for improved flow, lower EGTs, and a more aggressive exhaust note on off-road/competition trucks where emissions rules allow.

• Brand: Mel’s Manufacturing / Flo-Pro

• Part Number: MEL412029-SS890NM

• Manufacturer P/N: 412029-SS890NM (alt. Flo-Pro SS890NM)

• Product Type: 4" stainless down pipe back / flex pipe back single exhaust system

• Material: T409 stainless steel tubing

• Tubing Size: 4" diameter

• System Layout: Down pipe back, flex-pipe back, single tailpipe

• Includes: Pipes, flex section, hangers, clamps, hardware (no muffler, no exhaust tip)

• Emissions/Use: Off-road / race-only system, not legal for street use where emissions equipment is required by law

• Vehicle Fitment:

  • 2019–2024 Ram 2500 / 3500 6.7L Cummins (truck family listed as 2019–2026)

  • Quad Cab & Mega Cab

  • Short box & long box

• Will NOT Fit: 2500 trucks equipped with factory rear air-ride suspension

• Key Features: Contour mandrel-bent 4" tubing, pre-welded contour-bent hangers, stronger flanges, TorcTite®-style clamps, designed to reduce EGTs and improve torque, throttle response, and fuel economy vs. stock exhaust