where to buy exhaust?

There's a little drone at some rpm's, but it's not bad at all. My cruising RPM to hold 70mph on the freeway is like 3,300 rpm,

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So I have the same mufflers as you then. I get the drone between 1500 and 2500 rpm, so it's not an issue idling or on the highway. Maybe it's just my engine build, but I hoped they would sound better. For the price of what I paid, I can't really complain I suppose. I'll try to take some pics of their work.