The exhaust looks great! Hugs the bike nicely. This really is going down in history for me as one of the best builds I've seen! Please please please post some videos of you riding it around.
Also, how is that pipe hitting? Low mid or high? My guess is low since its a wheelie machine.
Fyi they make lots of after market performance crop for that motor for when your ready to do more. I think you can make it a 250cc