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1,389 rwhp Turbo Coyote Built for the Streets


When it comes to street cars, it seems as if life begins at 1,000rwhp. So when we saw the 1,389 rwhp combination that belongs to Graycen Mashburn of Oklahoma City, we knew we had to learn more about it. Mashburn made the haul down to Haltech USA in Lexington, Kentucky to put his 2012 Mustang GT on their Mainline Pro Dyno 3000 to get his new Haltech Elite 2500T tuned up. On track, the car has run a best of 5.06 at 141 mph while running low boost as they dial in the suspension system.

Panhandle Performance’s Mark Biddle is responsible for building the short-block, which uses an OEM block with Darton sleeves. A Boss crankshaft swings a set of Oliver billet rods and Manley pistons while Total Seal rings keep the compression on the topside of the slugs. Martin Smallwood designed the Comp camshafts and Panhandle Performance ported the factory cylinder heads. A CPR turbo kit is home to a Garrett GTX-5018R turbocharger, with a 88mm compressor, and an air-to-water intercooler. The combination is run exclusively on E98 fuel. The Mustang tips the scales at 3,420 pounds while Santhuff shocks and struts attempt to keep the Mickey Thompson ET Street Pro 275 radials hooked up.

The Mainline Pro Dyno 3000 at Haltech is a unique one, it uses a hub system that bolts on to rear-end housing. It ensures there is no slip, giving accurate information on true output. The Mainline dyno is capable of holding up to 3,000 wheel horsepower, which means it can handle most vehicles except the extreme twin turbo Radial and Pro Mod cars.

Mike Galimi
Mike Galimi is the Director of Content & Marketing at ProMedia Publishing and Events with nearly 20 years of experience in motorsport writing and photography.