I have an 07 883 and I put on the (SE2 Screamin Eagle 2 )exhust around Christmas still happy with them, love the sound.I have a '06 sportster 883 custom with stock exhaust. please excuse my ignorance(first harley) but i want to make it alittle louder. #1 is the first place i should look the Harley shop? #2 i have a year left on factory warrentee, do i have to go thru them? any advice? Thanks!