In part 4 of Project STi we got some pretty good results with some tuning by XS Engineering that nicely complemented our bolt-ons. However, we were stymied in our efforts to extract more power by a ...
When Subaru introduced the WRX Impreza it was deemed as one of the most performance-oriented four-door sedans with great aftermarket potential. The ensuing years saw the introduction of the WRX STi - ...
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