The float bowl venting mod isn't so much of a power mod, but it will let you correctly jet your bike, hopefully using much smaller main jets (assuming everything else remains stock) for better running, crisper response and better mileage. I've done it, and with both a K&N air filter and a full Muzzy's exhaust, I still needed to switch to one size smaller main jets (168/178). most 7R owners swear by it.
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