Yeah it's less restrictive. It was designed for the GS-500 and a couple of other big Suzuki cruisers but we have the same air filter as they do. The opening inlet which lets in air is a little fatter than the stock filter and the filter element flows more than stock. I mean, it's a K&N. That's what it's supposed to do.
You're going to have to re-jet. If you feel like taking that project on, I'd at least go this route and not waste my time boring holes in the muffler and modding the air box.
Just go ahead a get the replacement muffler and drop in this K&N.
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