The RS-3 Is a very good exhaust. HMF makes a great exhaust as well and they have quiet cores for sound regulations.You may check to see if Yosh has the quiet core as well.
Do you know what the db rating is? I am looking for exhaust for our 400I have a new KFX 400 Titanium full Muzzy for sale in the ads section.
Appreciate everyones input...Also how much you want for the exhaust??