Twin-Turbo Shelby GT350 Mustang Brutalizes Its Rear Tires

Ford built the Shelby GT350’s Voodoo V8 to rev to 8,250 rpm with zero turbochargers anywhere near it. A shop in Martinsville, Indiana had other plans, bolting on twin turbos for staged packages up to 1,400 horsepower. Read on to find out what it takes to nearly triple a purist engine’s output without losing what makes it distinct.

Ford built the Shelby GT350’s Voodoo V8 to redline at a screaming 8,250 rpm without a single turbocharger anywhere near it, a deliberate decision meant to set the car apart from every other Mustang on sale. So when a shop in Martinsville, Indiana decided to bolt not one but two turbochargers onto that same flat-plane-crank engine, it was not just adding power, it was rewriting the entire personality of one of Ford’s most purist performance engines. The results turned a routine burnout into something closer to a demonstration of exactly how much abuse a stock-block Voodoo can survive before something finally lets go.

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The Voodoo Was Not Built to Be Boosted

Ford’s 5.2-liter Voodoo V8 uses a flat-plane crankshaft, an unusual and expensive design choice for a factory engine that trades low-end torque for the ability to rev far higher than a conventional cross-plane V8, all the way to 8,250 rpm. In stock form it makes 526 horsepower at 7,500 rpm and 429 lb-ft of torque, sent through a six-speed manual to the rear wheels only, with no factory forced induction anywhere in the original design philosophy.

Fathouse Fabrications’ Answer: Add Boost Anyway

Fathouse Fabrications, based in Martinsville, Indiana, built its reputation packaging twin-turbo kits specifically for the GT350’s Voodoo engine, offering staged packages ranging from a 1,000-horsepower entry point up to 1,400 horsepower for buyers willing to push the platform to its absolute limit. Developing a turbo kit specifically around an engine architecture never designed for forced induction takes a different approach than a generic bolt-on kit, and it is part of why the shop’s GT350 packages carry the reputation they do.

The Hardware Behind the Numbers

The core hardware includes a pair of 62mm Xona Rotor dual-ball-bearing turbochargers mounted low in the engine bay to manage heat, paired with new stainless headers, an upgraded fuel system, a high-flow intercooler, and a twin-disc clutch to handle the additional torque. Every one of those components exists to solve a specific problem the Voodoo’s original design never anticipated, from heat management around a flat-plane exhaust pulse to a clutch capable of surviving torque figures the factory six-speed was never engineered around.

Nearly Tripling the Factory Output

Even the entry-level 1,000-horsepower package represents almost double what the Voodoo makes in stock trim, and the flagship 1,400-horsepower configuration comes within reach of nearly tripling it, all while retaining the engine’s signature flat-plane-crank scream at high rpm. That is a rare combination in the tuning world, most engines lose their factory character entirely once forced induction gets bolted on, but the Voodoo’s high-rpm sound signature reportedly survives the transformation according to owners who have driven turbocharged examples.

Why the Flat-Plane Crank Complicates Turbocharging

A flat-plane crankshaft produces an even, evenly spaced exhaust pulse similar to a four-cylinder engine’s firing order, which is part of why the Voodoo revs so freely and sounds so distinct compared to a traditional cross-plane V8. That same firing characteristic complicates turbo packaging, since exhaust pulse timing and manifold design have to account for a completely different pattern than the vast majority of turbo kits on the market are engineered around, explaining why so few shops attempt a Voodoo-specific twin-turbo kit at all.

What a Burnout Reveals About the Build

The burnout captured in Fathouse’s demonstration is a small taste of what that additional boost does to a car never designed to put big turbo-style power to the pavement. Watching a factory rear differential and stock-width tires try to contain output several times beyond what Ford ever engineered them for shows exactly why builds at this power level demand supporting drivetrain work well beyond the turbo kit itself, from axles to differential gearing to tire compound choice.

How This Compares to Factory Forced-Induction Mustangs

Ford’s own forced-induction Mustang, the supercharged GT500, arrived from the factory with an engine and drivetrain purpose-built around boost from day one. Fathouse’s approach retrofits that same power philosophy onto an engine architecture Ford explicitly designed to avoid forced induction, which makes the achievement more impressive from an engineering standpoint even if it lacks factory warranty backing. Comparing the two approaches highlights just how different the design compromises look when boost is planned for versus added after the fact.

The Broader Twin-Turbo Voodoo Community

Fathouse is not the only shop chasing serious power out of the GT350’s Voodoo engine, but its staged package approach, letting a buyer choose a power level rather than committing to the most extreme build immediately, has helped it build a following among GT350 owners who want forced induction without necessarily chasing the outer limits of what the platform can survive. That flexibility is part of why the shop’s name keeps surfacing whenever a twin-turbo Voodoo build gets shared online.

What This Build Means for the Voodoo’s Reputation

Builds like this one have quietly reshaped how enthusiasts talk about the Voodoo engine, from a purist, naturally aspirated showpiece to a platform that can absorb genuinely enormous power increases when built correctly. That shift matters for GT350 resale values and for how future tuners approach the platform, since a stock-block engine capable of surviving 1,400 horsepower on the right supporting hardware changes the calculus for anyone considering forced induction on their own car.

What Warranty Buyers Give Up for This Kind of Power

Bolting a twin-turbo kit onto a GT350 voids the factory powertrain warranty entirely, a trade-off buyers accept knowingly given how far outside Ford’s original design intent these builds operate. That reality pushes most twin-turbo Voodoo owners toward aftermarket extended coverage or simply budgeting for their own repairs, since no factory-backed insurance exists for an engine running two to three times its rated output. For enthusiasts chasing numbers this extreme, that trade-off is treated as simply the cost of admission rather than a deterrent, part of why shops like Fathouse keep finding customers willing to make the leap. That warranty trade-off has not slowed demand for these kits, and Fathouse continues to book builds from owners who have already made peace with servicing the engine themselves rather than relying on a dealership safety net.

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