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I bought a newSG last week and did the Rush 2.0, SERT, SE A/C. If I had to do it again I would go 2.25 or bigger as stated above. They sound ok, but a little quiet for my taste. Then again I only have 50 miles on the new bike.
Biggest baffle you can place on the '07s is 2.25'. I have them on mine and they are perfect. Something about the 2.50' doesn't have enough back pressure and can't be dyno'd.
Go with the 2.25'...they are loud enough that you will be heard but can still listen to the radio.
07 roadking with 1.5 rush slipons. Nice deep sound that's not too loud. I had drags and pythons on my other bikes but wanted something with good sound, but not too loud. I have been satisfied with Rush 1.5's. I can't really tell if they added any performance cause they were installed before 300 miles.
I have the V & H True duels with the rush mufflers you cant beat the sound. Im running the 2.50" but also have the 2.25" I think you would be very happy with the sound and performance.
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