Let's take a look at their Stage I upgrades first. Like other tuners, Rebellion offers a piggyback box for the M133. They price their unit at 665 British Pounds. For that money you get in an increase in power from 359 horses at the crank to 401. A solid gain of 42 crank horsepower. Torque rises quite a bit from 337 lb-ft to 394 lb-ft.
The Stage I is a solid offering and similar to what other tuners get with a piggyback box. All these Stage I offerings in this segment are pretty similar at this point. Where Rebellion begins to diverge is with their Stage II turbo upgrade. This is a mild upgrade that uses the OEM housing with modified internals. The piggyback still controls the ECU.
What does output go to? Torque rises to an impressive 449 lb-ft. 55 lb-ft more than the Stage I tuned M133. Horsepower goes up by roughly 30 peak horsepower does not show the torque gained under the curve which is where the upgrade really shines.
For £2800 the upgrade is priced fairly considering as of right now there is no stronger turbo upgrade option in the M133 aftermarket.
M133 tuning is still in its infancy but Rebellion Automotive's upgrades show the future is bright for the platform.