I've had a Thunderhead on almost all my bikes I'm sick of the look but I love the shape of the header pipe is there any other company that makes a muffler that would fit without modification?
You might try Fuel Moto e-series. They make a universal slip on. I'm not sure what the difference between a T header and other makes is?
http://www.eseriesexhaust.com/universal-mufflers/ (http://www.eseriesexhaust.com/universal-mufflers/)
without modification?
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NO