July 10, 200619 yr First of all...i just purchased an 05 Subaru Baja Turbo...and i LOVE IT...i've been a honda guy my whole life but this subaru kicks rump roast... ok with that said... i have a couple questions about the baja (bare with me again i've never owned a subaru and know nothing yet)....i was wondering if i put exhaust and BOV on it if it's going to kill my MPG..this car/truck is my daily driver and gas is expensive enough... also what are some good brands to go with for exhaust on subarus? thanks for your help!
July 10, 200619 yr A more free flowing exhaust can go either way. It can improve the engine's breathing, which should improve efficiency, but it'll also improve power, and if you're on the go pedal more....your mileage will be less. As for the BOV, don't get one. Subaru uses MAF sensors, so if you blow off air that is already metered, the engine is actually seeing less then it metered, and your a/f ratios will be rich. The stock system uses a bypass valve, which dumps the air back into the inlet side of the compressor. This also aids in keeping the compressor spooled during shifts.
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