FABRICATION COMPONENTS — 1989–1993 DODGE RAM 5.9L CUMMINS (12-VALVE)

Build clean, reliable custom parts for your First-Gen with CPP Diesel’s curated selection of stainless bends, aluminum tubing, reducers/transitions, V-band flanges & clamps, silicone couplers, T-bolt/constant-tension clamps, weld bungs and fab tools tailored to 1989–1993 Dodge Ram D250/D350 projects.

Shop by Subcategory

• STAINLESS & ALUMINUM TUBING — PPE 45°/90°/180° bends in 3.0–5.0" OD, plus reducers & more.
• V-BAND FLANGES & CLAMPS — HX35/HX40/S300/S400 outlets, compressor and turbine connections.
• CLAMPS & ACCESSORIES — band/U-bolt clamps for exhaust and charge-air plumbing.
• SILICONE COUPLERS — 4.0" straight couplers for intercooler/charge pipes.
• T-BOLT CLAMPS — 304SS clamps sized for common hose ODs.
• WELD BUNGS — aluminum AN bungs for custom plumbing.
• FABRICATION TOOLS — manual tubing bead roller for leak-free charge pipes.

Featured for 1st Gen

• PPE Stainless & Aluminum Bends — 45°/90°/180° in 3–5" OD for exhaust & intercooler piping.
• 4"→3" 304SS Reducer — smooth transition for tight packaging.
• CPP V-Band Flanges (S300/S400) — weld flanges and clamps for turbo outlets.
• CPP HX35 Outlet Flange — weldable outlet for custom downpipes.
• Constant-Tension 4" T-Bolt Clamp — maintains seal under heat-cycle.

Why Buy from CPP Diesel

• First-Gen Focus: Parts and hardware that pair well with 1989–1993 Cummins builds.
• Trusted Brands: CPP in-house, PPE, Vibrant, Diamond Eye, more.
• Expert Support: Help sizing tubing, couplers, and V-band interfaces for HX35/HX40/S300/S400.
• Fast Shipping: Popular fab components ship quickly from U.S. warehouses.

Explore the full 1989–1993 Cummins catalog for complementary upgrades.

Helpful Notes

• Measure twice: Match tube OD, coupler ID, and clamp range to avoid leaks.
• Material choice: 304SS for hot-side/exhaust; 6061 aluminum is light for cold-side piping.
• V-band sizing: HX35/HX40/S300/S400 outlets differ—confirm flange OD and seat style.
• Bead your pipes: Beaded tube ends + constant-tension clamps reduce blow-offs under boost.

Frequently Asked Questions

What tube size should I use for intercooler piping?

Most First-Gen builds use 3.0–3.5" cold-side tubing. Verify intercooler/turbo outlets and space before ordering.

When do I need constant-tension clamps?

They’re ideal where heat-cycling loosens standard T-bolts—use on hot-side charge pipes and couplers.

Are V-band connections worth it?

Yes—V-bands seal well, allow quick service, and save space. Match the flange/clamp to your HX35/HX40/S300/S400 unit.

Can I mix stainless and aluminum in one system?

Yes, but keep stainless on hot sections. Use proper transitions and isolate dissimilar metals when possible.

Do I need to bead aluminum tube ends?

Highly recommended for boosted applications. Use a bead roller tool for reliable coupler retention.