
12V Spin-Lock Bolt Kit for 1989-98 Manifolds
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CARB Exempt – Legal for Installation and Street Use in California
The DPS First Gen Cummins Exhaust Manifold is a high-performance, direct bolt-on replacement for 1988–1993 5.9L 12V Cummins engines. Designed specifically for the 1st Gen rectangular port head, this manifold flows significantly better than stock, reduces rear-cylinder EGTs, and provides maximum durability with 3-piece expansion joints.
Single-piece stainless manifolds expand and contract up to 2x more than our ductile iron manifold. That extra movement stresses your head, gaskets, and bolts—leading to leaks or failures. The DPS 3-piece design allows natural thermal flexing without damage.
Most competitors machine their 24V round-port castings to fit 12V heads. This creates smaller, restricted ports and poor airflow transitions. The DPS First Gen manifold uses a dedicated rectangular port mold—engineered specifically for 12V flow performance. It’s more expensive to produce, but gives you better power, smoother EGTs, and optimal fitment.
Still the best-priced 1st Gen Cummins exhaust manifold on the market—why settle for less?
This Manifold has done what is says. Turned up 12V 362 turbo injectors and AFC mods on a 5 Speed. Lowered EGT by 75 degrees and spools at around 1550 Rpms about 200 Rpms faster than the stock Manifold. Easy to install Nice coating and welded between flanges all in a 3 piece. Sure will last for a long time. Truck runs smoother and doesn't feel laggy at all had to remove some pre boost to tone her down a bit. Thanks DPS just what I needed .
sounds like new truck at 305k...mine shrank badly on ends, does make my 66mm turbo sing 2-300 rpms earlier and the top end it loud n pulls hard but also has light pedal power too
Great manifold and even better price compared to others costing more.
Shipping was sooner than expected and product is exactly as advertised