Makes car build boost harder and keeps to redline. EMI chip keeps it from running lean a partial throttle-high boost situations.
EMI will also keep you Uni-chip from detuning itself. Has a boost cut defeat or can use stock boost cut. Paid $79 for MBC and $250 for the EMI. Will sell both for $150 you pay shipping. Going away on business tomorrow until 19th but first guy to offer $150 gets it on the 19th. Transforms a stock WRX.