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Old 02-13-2006, 06:16 AM   #7
Scooby Guru
Member#: 8808
Join Date: Jul 2001
Chapter/Region: NESIC
Location: WRJ, VT
2011 WRX


The main issue with just slapping on boost control with these cars is that the stock fueling runs rather lean in the low load/low RPM sites where a stock car isn't making boost, but a mildly modified car is. As a result, even at pre-wastegate pressures, the car can become knock prone from simple exhaust modifications. Similarly, the MY04+ cars have some well known issues in the switchover from closed loop to open loop fueling, and lean conditions are a symptom of aftermarket exhaust and boost control on cars without supporting engine management.

The current feelings with tuning the WRX seem to fall into the piggyback vs. reflash communities, usually evangelized by the UTEC vs. AccessPort customers. The pros/cons of both are hashed out regularly in the history of this forum.

If you're looking for the absolute cheapest way to tune a 2002-2005 WRX, get the OpenPort cable (around $80 from and reflashing your ECU with the free tools from While the process is nowhere near as simple or as well documented as the products from Cobb or ECUtek, you can modify your fuel, timing, and boost maps to make the car run safely.
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Kha0S is offline   Reply With Quote