What year model bike do you have?? Drilling into throttle body=bad idea.
The newer model bikes have a vacuum stem on the top of the throttle body already so check and see if your bike has one.
The only air cleaner that needs a vacuum line is a hypercharger and for what it is worth the hyperchargers are a POS and they won't make your bike run any better.
You are much better off with a stage 1 intake and a good K&N filter.