Once you get a TBE exhaust for the GD model wrx, the std ecu get get out of tune, your car will run crappyy ( jerky).. and also without a tune you wont get the most out of your exhaust.

Get a verso tune, your will run better and have more power.... also because its just a re-flash... it still retains the factory ecu module.

Zorts + CAI + verso =