Hellion Turbo Debuts Top-Mount R-Series Twin-Turbo Kit For S650 Mustang

High-revving Coyote V8s respond ridiculously well to boost, and most S650 Mustang owners know that twin-turbo kits easily push these engines into four-digit horsepower territory.

For years, Hellion Turbo built its reputation on the Street Sleeper system, which tucked all the plumbing underneath the chassis out of sight.

At the 2026 SEMA Show, the company flipped the script by unveiling its R-Series top-mount kit, placing a pair of reverse-rotation turbochargers right at the top of the engine bay for everyone to see.

Moving the snails upstairs took serious engineering and careful packaging. Company owner John Urist notes that customers kept asking for a visible setup that matched the proven output of their hidden systems.

Instead of using the long 4-into-1 collector headers from the bottom-mount kit, the R-Series relies on compact, forward-facing exhaust manifolds. That change frees up room in the tight S650 engine bay while keeping the layout clean.

The package pairs a 3-inch exhaust with dual 45 mm Turbosmart wastegates in a rowdy screamer-style arrangement. Standard 62 mm units can support around 1,200 horsepower, while buyers chasing even bigger numbers can step up to optional 64 mm turbos.

Because the crew finished the SEMA Dark Horse build right before the Las Vegas show opened, dyno testing will happen shortly after the event wraps up.

To help builders dial in their specific fuel and engine combinations, Hellion Turbo is releasing the R-Series initially as a tuner kit. Palm Beach Dyno handled the remote calibration on the show car, and a full network of partner shops stands ready to support customer builds across the entire country with custom tuning solutions.

Subtlety is completely off the table with this setup. Between the polished compressor housings sitting front and center and the aggressive wastegate soundtrack, the R-Series is built for drivers who want their hardware noticed at every stoplight and track day.

Priced at $11,995, this top-mount arrangement gives S650 enthusiasts a loud, proud alternative to the quiet undercarriage layout. Shipments from Hellion Turbo are slated to begin in February of next year, giving pony car fans plenty of time to plan their spring upgrades.