also the stock injection will compensate for it.
as far as hp gain, not much.
you have to increase airflow to see alot of hp gain, which also means the more intake of air the less restrictions you need on the exhaust so the bike can inhale and exhaul more efficiently.
so if your looking for hp gains, get an air kit and aftermarket exhaust.
if you want some good sound without alot of money with hardly any hp gains, do the cat removal.
hope this helps.
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