Thumpe's setup (check over on Buellridersonline.com) is really the best option. It's not cheap, but it's not expensive either. And it works...the issue with the Blast's carb is supporting it when you delete the stock airbox setup. Thumpe's 'superboot' solves that issue for his application while allowing for a true stage 1 solution.
I know that sounds like an advertisement - it's not. I've had a Blast for years and years...and I've tried numerous setups and solutions.
By the way, any airbox delete is going to require a re-jetting - to at least a 45 pilot (46 better in most cases) and a 175 main jet (not to mention a needle shim). Thumpe has the hardware for all this at*very inexpensive prices.
My Blast:
VT Blast 1.jpg