how well does this sprocket perform on the top end? Do you lose a lot of bottom end? I'm looking to keep the front end down will this help?

 

Unless you are doing some tight trail riding I would suggest the 14. The 660 will pull it fine, especially if you have a aftermarket pipe on the Raptor.I could hardley keep the front end down on my 660 after I installed a BG exhaust.The 14 helps this out a lot.It will pick your top end up by about 2 or 3 mph.