Cobra 3" Slash Cut Slip Ons. They are not quite as loud or harsh as the V&H Straightshots I had on my Sportster 48, but they are still pretty great. You can also rotate the end caps on them in case you want a slash cut, bologna cut, etc. I use them on my Slim and I love them.
That's what I have also, not too loud but great sound when you hit the gas.