
Your Pro R makes 225 horsepower — and it's holding out on you. 380 to 500 turnkey horsepower, measured on our dyno and matched to your fuel and elevation, so the hill, the straight and the pass are never a question again.
| Kit | Crank HP | Boost | Fuel | Breathing | Best for | Price | |
|---|---|---|---|---|---|---|---|
380 Turnkey |
380 (+155) | 8 psi | 91 pump | Stock intake & exhaust | The huge everyday jump — 100% stock engine, OEM drivability, fill up anywhere | $7,249 | |
425 Turnkey |
≈425 (+200) | 8 psi | 91 pump | + slip-on exhaust + dune intake (included) | Pump-gas power ceiling — clutch targets 8,200–8,400 rpm at max boost. Dune intake: not for dusty trails | $9,399 | |
460 Turnkey |
460+ (+235) | 12 psi | 110 race | + full exhaust system (included) | Race-gas weekends — more knock resistance, more boost, still a stock engine | $9,949 | |
500 E50 |
500+ (+275) | 14 psi | E50 | + full exhaust + upgraded fuel system (included) | The flagship — more than double factory output | $9,999 |
Every tier is the same Rotrex centrifugal platform — head unit capable of 550+ hp and 22+ psi with supporting mods — so you can start at 380 and climb with pulleys, fuel and tune. All kits: factory baseline 225 hp · off-road and competition use only.
Every Pro R kit is built around the same in-house supercharger — the tiers are boost, fuel, and tune. 380 runs pump 91. The 500 E50 tops the range on ethanol blend. All four curves live on the dyno page.




Two Xpedition kits — the intercooled flagship and the MT — from $5,700. Builder, base-with-tune, and complete tiers on both.


Every calibration is built on the Clearfield dyno and delivered for the fuel you actually run — 91, E50, or both.
Faster. Better. First.