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My wife had Cycle Shacks on her Sporty and they were too loud for my taste. She now has Rush (with 1.75's) on her Heritage and we both think it sounds pretty good. I vote for Rush.
Rush 2.0 works well on my Street Glide. Nice deep tone with some volume but not too loud. I have not owned Cycle shacks but have heard some and they are loud and tend to be higher toned.
I know a full system will give me more gains but will the rush slip ons have much HP, TQ improvement? Looking hard at full systems but all that I have heard (youtube) are too loud for me.
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I've got FuelMoto's Power Package (PCV, SEAC, Rush 2") including their aftermarket 2-1-2 headpipe. Very impressed with the Performance and Sound. Highly recommend them.
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