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You have a turbo or nonturbo? Those Cobb AccessPort ECM modules are nice, five programs, switchable pretty much on the fly if the gas in your tank is up to it, from economy mode on regular unleaded with turbo boost disabled up to I believe 325 hp on 110 octane racing gas. You’d need a catback exhaust to make the most of it, Subaru boxer engines sound good with the right catback. I’ve got an 07 Legacy GT Limted wagon, it’s a fun and practical car. Friends on ski patrol had them in college, I liked them but it never entered my mind to buy one until this car.

It's an 02 WRX. I use open source maps and a Tactrix adapter to program the ECU. No wild mods, just dumped the up-pipe cat, and the downpipe cat with a divorced wastegate pipe. Was my daily driver for years, now I do not have to worry about smog checks, I uncorked it a bit. Progarmeed for about 18 psi boost, a major hit over the stock 12-13 psi. Much more and I would be into bigger injectors and the endless circus. My last car hopefully so I cannot get crazy.

Reality is, big power in Hawaii is not of much use anyway, other than embarrassing Harley clowns..........