2R Racing sells a 2" CNC machined Billet exhaust tip for the 450X. Looks decent and is under $50. Simple design and easy installation. If you search Ebay for "Exhaust Tip 450X" you will see 2 or 3 listings, one from 2R Racing out of Minnesota and the other based out of California (Free Shipping for both). Or search Info@2rracing.com
. Looks better than stock. Be aware that it has no quiet insert but does have a screen.