any Harley guys here?

I'm with Rumble on this!
More gain from that box than any other single mod, though only after freeing everything up...
Some (not so) bright dealer told someone else I know "you don't need that", after hooking him up with all the other ****.
I told him his dealer didn't know jack **** and that I'd pay for the box if it wasn't the best thing he did...
All told I kept my money and he was glad I made the offer!
Stock box has artificially low rev limit (5500RPM), to get past EPA sound limit (test is conducted at half of redline), hence test at 2750RPM.
The good box gives you 6250 redline... Those tiny stock mufflers wouldn't pass the test at 3125RPM and H-D wasn't going to bend on their trademark styling.