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UEL or EL, you won't notice the gains that much. UEL is actually a subaru design flaw, it's just how they made it. the exhaust gases don't move as smooth, since two cylinder runners are squished. STi's gain a good 20whp with EL header and tq, depending on what else is done to the car.
on this small 2.0 motor though, i doubt there will be a significant difference. i for one, WANT the subaru rumble in this car. it'll be the only two door sports car with that subaru growl and people will be like wtf. i can't wait.
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