T3 Manifold for 12V Cummins Exhaust Manifold 1989-98
DPS presents a game-changing T3 Manifold for your 12V Cummins Exhaust, covering the years 1989-1998 for your Second Gen Cummins 12V. This is a direct factory bolt-on. The factory manifold has a T3 flange.
**Legal for use in California with an E.O. Exemption.
- This is a direct factory bolt-on.
- Increase turbo spool-up, reduce EGT's, and experience a manifold that flows 23% more than stock.
- CFD Designed, flow-tested, and balanced for optimal exhaust flow, it includes expansion joints to prevent cracking and three ports for pyrometer and pressure fitting.
- Made from nickel-laced ductile iron, it boasts a black high-temperature ceramic based coating.
Say goodbye to stainless steel alternatives, and opt for the best exhaust manifold for your Dodge Cummins 5.9 diesel. With a separate rectangular port mold for enhanced exhaust flow, our 12V 2nd Gen Cummins manifold offers unparalleled performance.
**Enhance your manifold purchase with our Serrated Spin-Lock Bolt Kit. When upgrading to the Spin Lock Bolt or Multi-Layer Gasket Kit, please note that these are upgraded components. The standard bolts and gaskets will not be included with the upgrade option.
Replace your 12V 5.9 Cummins exhaust manifold with confidence, for applicable OEM Part Numbers: 3911349
Most customers see noticeably faster turbo spool, stronger midrange, and lower exhaust gas temps under load. A freer-flowing, pulse-divided manifold helps the turbo light sooner and reduces drive pressure, which improves towing and overall responsiveness.
It’s one of the best first mods for a 12-valve. You get cooler temps, better drivability, and a solid foundation for adding an upgraded turbo later.
7 Reviews
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Great Mod For High Output 12 Valves
I don't normally bother with reviews but I just had to on this one. They claim 25% increase in flow and 100 deg reduction in egt. Yes. Verified true. My turbo lights off barely above idle now. The stock manifold was chocking my engine really bad. I did alot of work to get up to 500hp 1200 lb ft torque and this was the final piece needed and it really made a big difference. Worth every penny. Stock manifolds are only good for stock engines. This was really needed.
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Manifold for 91 12valve
It spools faster on boost an increase on boost would recommend to anyone
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Manifold
Great looking quality better looking than some of the other manifolds I’ve seen and has dual ports for temp sensors recommend it.
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DPS X 98 12V s362 turbo215 Pump
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 .
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Perfect!
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
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12v Manifold
Great manifold and even better price compared to others costing more.
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On time
Shipping was sooner than expected and product is exactly as advertised
