Loud pipes.

I had a bike with an aftermarket loud pipe and found car drivers treated me the same as they do now, even though I now use a bike with the standard factory exhaust.

There’s no difference in how I am treated on the road or in the way car drivers see me. The only difference is the way I am perceived by the people who matter (the police and the people who may complain about my noise) I ride a 4 cylinder sports bike now in standard trim.