The Verdict
With carefully selected bolt-on parts, an eye for engine efficiency and an aftermarket engine management tuning solution, we were able to significantly increase power output on our 2011 Subaru STI. By optimizing fuel and ignition maps with the COBB AccessPORT engine management system, we were able to increase power output levels on the EJ257 engine while providing a safe and stable pump-gas tune with an equally safe and more powerful race gas setup.
The Bottom Line
| HP Level | HP Increase | % Increase | Total | |
|---|---|---|---|---|
| BASELINE | 246.1 | – | – | – |
| Test 1 Crawford Perf. FMIC |
260.9 | 14.8 | 6.0% | 14.8 |
| Test 2 Go Fast Bits Pulley |
266.2 | 5.3 | 2.1% | 20.1 |
| Test 3 VP Racing Fuel MS109 |
289.5 | 23.3 | 8.7% | 43.4 |
| * * * * * | ||||
| FINAL POWER | 289.5 | 22.8% | 43.4 | |