i have the Uras RS, 80mm on stock KA, my butt dyno says there is a power difference, but i hate the friggen noise, don't get me wrong, i love the sound/tone, but crusing at anything above 2.5k hurts my head and i can't hear the bass from my speakers. I run with a silencer, but i think it sucks a bit of power, or maybe that is just mis-preception due to the sound.
you really shouldn't have a problem, but i'd recommend getting a ride in a NA with turbo exhaust to find out what you're getting into.
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Paul
Black and Red
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