I just put an FMF Powercore4 on my 09SF. I also re jetted it and put it on a dyno. It went from 18hp stock to 23.5hp with just the new muffler and rejet. I like the sound of the FMF, it's not annoying at all. Probably the best money for the most result I've spent on the bike so far.

I also put a K&N air filter in and am waiting for a KDX200 snorkle to arrive.

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sweet thanks ya iav been riding it faairly hard using all he rpms ha i guess il do the oil change then im at about 300 miles i think