I just bought a 13 ultra classic. the bike has head pipes with the cats cut out. I bought some 4" rinehart slip ons but they didn't give me the volume I'm looking for. Will true dual headpipes do the trick?

 

You need to play around with the baffles in the Rineharts first before you go spending more money on more slip-ons. Try some of the baffles from www.bigcitythunder.com first.

 

Yeah Rinehart makes their own hi-flow baffle too and it's a little louder apparently.