Time was, you could just plop parts on your car, and everything would be fine. These days even a simple intake can wreak havoc with your car's sensitive air/fuel metering, and modifying without proper ECU tuning can be disastrous. Look to Mach V Motorsports to set you up with the proper ECU tuning solutions for your Subaru.
Here you'll find the supremely powerful Cobb AccessPort ECU tuning systems for all turbo Subaru cars (including WRX, WRX STI, Legacy GT/Outback XT, and Forester XT), 3-port boost control solenoids, and stand-alone boost controllers for managing manifold pressure.
AP3-SUB-003 BL BM BP EJ25 GE GH GR GV SH
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bcs BL BP EJ20 EJ25 GD GE GG GH GR GV SG SH VASTI
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BC-SBC BL BM BP EJ20 EJ25 GD GE GG GH GR GV SG SH
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BC-HPBC BL BP EJ20 EJ25 GD GE GG GH GR GV SG SH
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BL BP EBCS ECBS EJ25 GE GH GR GV SG VASTI
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EBCS FA20T grm057041 VAWRX
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712750 EBCS ECBS EJ20 EJ25 GD GG
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bcs EJ25 GD GG GH grm057002
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bcs BL BP EJ25 GE GH GR grm057032 GV SH
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bcs EJ25 GR grm057007 GV VASTI
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bcs FA20T SJ VAWRX
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AP3-SUB-005 BT BW FA24T WM
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BL BM BP EJ20 EJ25 GD GE GG GH GR GV SG SH
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BL BP EBCS EJ25 GD GE GG GH GR GV SG VASTI VAWRX
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EJ25 FA20T FA24T SJ VASTI VAWRX
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EBCS ECBS EJ20 EJ25 GD GE GG GH GR GV VASTI VAWRX
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EJ25 GE GH GR GV SG SH
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bcs BL BP EJ25 GE GH GR GV SH VASTI
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bcs EJ25 GR GV metalmani VASTI
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bcs EJ25 GR GV metalmani
e_code, b_code, e_code, b_code, mani_type