DSM: Consolidated Top Mount Divided T4


Designed to to augment response and midrange with its low volume “4-2-1” design and minimal to no sacrifice in high rpm power. Fits nearly all T4 framed turbos, including Garrett GT42, Sportsman frame, and Borg Warner S400s.

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  • Maintains alternator and power steering in factory location.
  • Near equal length primary runners.
  • Uses proper small volume merge collectors.
  • Designed to tuck the turbine housing and runners close to the engine and away from the radiator, fans, and other heat sensitive components.
  • Fits nearly all T4 framed turbochargers up to a Garrett GT42 or the Borg Warner S400s.
  • (2) TiAL MVS flanges on collector.
  • Fits 1g and 2g with a 6 bolt or 7 bolt engine.
  • 2g will require a 1g style radiator with the hose inlet more towards the passenger’s side. Large frame turbos such as GT42, sportsman, and S400 compressor covers will not clear in a 2g unless the radiator is moved forward or tucked scirocco style radiator. (S300, PT6x66, GT35 etc no problem)
  • When the alternator is moved and a forward facing oil filter housing used, there is room for a 3.5″ or 4″ full exhaust under the pan.
  • 321 Stainless, 100% Fully Backpurged.

For those wondering about the consolidated runner design:

It joins the two paired runners in a twin scroll configuration, and can be thought of as a “4-2-1” design commonly seen in naturally aspirated applications. All twin scroll setups are essentially a “4-2-1” or “Tri-Y” design, as it is exactly what happens in the turbine housing entry anyway, but in a consolidated runner design it just happens at a different point (sooner). Two runners sharing the same space isn’t a big deal when they are firing in an alternating order and only one exhaust pulse sees each scroll (and runner) at a time. It’s important to keep in mind that the exhaust is a pulse, not just a standard flow rate- as well as one runner being of the same area as one side of a twin scroll T4 inlet so the sizing works out very well.

Dyno results at 38 psi with our two DSM top mounts here:


Current lead time as of May 8, 2024: 22-24 weeks from date of deposit.
*This is subject to change without notice, depending on order volumes.

For placing an order, please fill out the contact form here.

We don’t have a “buy it now” feature because we feel strongly about getting you the manifold that fits your setup and your goals. By filling out this client worksheet, you can help us begin that dialogue. After receiving the completed sheet, we will review it and contact you within 1-2 business days.


DSM: Consolidated Top Mount Divided T4