I bought a 883 Sportster 2005 and would like to change the exhaust. There is the one from Screaming Eagle with the Harley inscription and the one with the Schreming Eagle II inscription. Is there a difference in the sound or is there the difference in the performance? Does one know perhaps a sound alternative to these exhausts? Do I also have to change the carburettor and air filter when I use this SE? Thank you for your tips. I have only been proud owner of a Harley for a week and have Petra. Your tips are important to me because my dealer only thinks of his wallet at the consultation!