nothing,, if you changed the muffler you might have to re jet. If you want to check the tune, with either pipe, "Read the plug." Black is rich, white is lean, a nice walnut color is good. But for the most part you should be ok.
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ERIC DESARDI (old Crusty guy)
Moe's Cycle Service
Team "Reverse Sandbagging!"
The Bug Stop, Cycle Shack North, Cote Motorsports, Bob Lunsford Honda, Scorpion Tattoo, Texans BBQ, Anti Monkey Butt Powder, Honda East Toledo,and MANY others.