Choose stock-injector pump-gas tuning or a matched big-injector configuration for gasoline or E85. Stage 5x85 is a separate high-boost build that requires its matched pump and relay system.
Every package includes your selected FastUTV calibration, RTD4 tuning interface, correct Can-Am adapter cable and required licensing.
Package choices
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$799: tuning, RTD4, cable and licensing with the stage’s required injectors already fitted.
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$1,499: the same package plus three new, matched 1000cc injectors for a big-injector stage.
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New wastegate: +$299 when selected for a big-injector stage. Reusing a suitable installed actuator adds no parts charge.
Only combinations matching the selected stage are offered. “Installed” means that the correct supporting parts are already on your vehicle. Parts marked “add” or “supply” are included in the displayed total.
Vehicle fitment
2020 factory 195 HP Maverick X3 Turbo RR: X ds, X rs, X mr and X rc two-seat models; MAX X ds, MAX X rs and MAX X mr four-seat models. Retains the factory turbo. Select this listing for 2020 RR vehicles only.
Choose by model year and original factory horsepower. FastUTV matches the delivered file to your ECU, injector specification, fuel and installed hardware.
Stage and fuel guide
The crank HP and wheel HP below are EVP’s published reference figures for these configurations, checked October 6, 2026. They describe the guide’s test setups; your result depends on fuel, build and test conditions.
| Stage |
Required fuel |
Crank HP |
Wheel HP |
Required equipment |
| Stage 1 |
91 AKI gasoline |
200 |
164 |
Stock injectors |
| Stage 2 |
91 AKI gasoline |
210 |
172 |
Stock injectors |
| Stage 3 |
91 AKI gasoline |
215 |
176 |
Stock injectors |
| Stage 3R |
93 AKI gasoline |
225 |
185 |
Stock injectors |
| Stage 3BI |
91 AKI gasoline |
210 |
172 |
1000cc × 3 |
| Stage 4x100 |
100 AKI gasoline |
245 |
201 |
1000cc × 3 |
| Stage 5 |
E85 only |
245 |
201 |
1000cc × 3 |
| Stage 5x85 |
E85 only |
255 |
209 |
1000cc × 3; 265LPH pump/relay/fuse |
Octane ratings are US AKI. Select one fuel-specific calibration. E85 stages require fuel matched to the calibration’s ethanol content; gasoline and E85 files are separate. These are fixed-fuel stages.
Supporting hardware and setup
Matched big-injector packages include the required RR injector adapter harnesses. Existing big injectors must have the matching RR adapters fitted. A suitable existing actuator can be adjusted to the selected stage; a new wastegate is optional.
Stage 5x85 requires its matched 265LPH high-pressure pump, plug-and-play relay harness and 20A F5 fuse already installed. This system is customer-supplied and is not included in the tuning or injector package. Follow the matched instructions and install the relay before powering the dash. Stage 5 E85 and Stage 5x85 are different configurations. Contact FastUTV if the pump system needs to be supplied or installed.
Set wastegate pressure and spark-plug gap to the delivered file’s instructions. Correct clutch setup is recommended to make use of the selected tune. Exhaust, clutch parts and other separately quoted build components are additional to the selected package.
WSRD charge tube and blow-off valve
Select the WSRD silicone lower charge tube, $189, with an optional WSRD blow-off valve for $249 more ($438 for the tube and valve selection). Choose the existing intercooled-model configuration. This optional hardware is purchased separately from tuning.
Choose color, upper-tube and valve options on the WSRD product page. Its current availability and any backorder terms apply.
Shop all tuning · X3 ECU and tuning packages · X3 performance parts
Technical guide: EVP stage chart for this factory-power family. FastUTV package pricing and RTD4 contents are shown above.
