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89+ 5.9L/6.7L Cummins Steed Speed T4 Rear Dump Exhaust Manifold
Great news for RV technicians
Finally! a long lasting high performance exhaust manifold for Motorhomes
The best performing manifold on the market. Constructed from CNC machined billet steel components, tig welded and ceramic coated for durability and reduced heat. This manifold is dyno proven to outperform every competitor and has seen gains of 80HP at 2000 RPM over the stock factory manifold on a 350HP motor. This manifold is also available with a T4 turbo flange for those who wish to upgrade their turbo.
Looking for proven diesel performance parts that actually fit and perform? We stock hand-selected upgrades for Duramax, Cummins, and Powerstroke platforms — no guesswork, no junk.
From tuning and exhaust to suspension, engine internals, and recovery gear, everything we carry is backed by real-world testing and used by builders who know what works. If it’s on our site, it’s here for a reason.
