Manifolds made specifically to fit the factory radiator and engine bay of early Evo, GVR-4, and CSMs. These all utilize a smaller runner size that allows the compact fitment, noticeably improve spool/response, and support much high power levels than often expected (800whp+).
If the radiator is tucked into the core support, all of the DSM manifolds/hot parts will fit as well; such as top mounts and larger runner options.

Hot parts are designed on dedicated mock up engines (6 and 7 bolt) to clear all factory components whenever possible and/or around your exact setup.
The downpipe ends with a flex bellow by the front axle/transfer case area to make it easier to splice into your current exhaust

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