AW-17220743903, GT-K4ZB5X3V
Free up flow and protect your 1st-Gen’s turbo with CPP Diesel’s curated selection of turbo-back systems, downpipes, exhaust manifolds, elbows, clamps, V-band hardware, mufflers, stacks, and tips for the VE-pump 12-valve 6BT. Options in 4" and 5" to match your build and sound level.
Explore the full 1989–1993 Cummins catalog for turbos, intercoolers, and fueling upgrades.
4" fits most builds with minimal drone and great flow. 5" can reduce backpressure and lower EGTs on higher-power setups but may be louder and require more clearance.
409 stainless offers better corrosion resistance; aluminized is cost-effective. Both perform when installed with quality clamps and hangers.
Yes, in most cases. Check shock/spring clearance and extend hangers as needed. Use band clamps and correct hanger angles to prevent rattles.
Add a muffler or resonator, keep tailpipe length after the axle, and ensure all joints are sealed with proper band/V-band clamps.
Yes—use an HX40-compatible downpipe/elbow and V-band. See Downpipes and V-Band parts.