I have 1.75 slip on. The only thing I've noticed is the popping when you throttle down. If you can live with this the sound is great.

 

no more popping after my dyno tune

 

Ireally likemy 2" Baloney Cuts.
Put them on a few weeks ago and took one 150 mile round trip since then. They are just right in the sound for highway running.
Here is a pick of my '08 Deluxe with the baloneys.
I just installed a springer seat rail last Sunday too.
Scott

[IMG]local://upfiles/47024/AEA1CFFE72DE4C289E8238F33ADB99B6.jpg[/IMG]

 

no popping, no dyno - just a power commander set up by FuelMoto.

 

Aviator,
Did you have a Power Commander setup for just the slip-ons?
Did you modify your intake too?
Scott