Ditto!!!Ruining a perfectly good exhaust that are not cheap to replace or find? You want louder, find a set of aftermarket pipes used and add baffles accordingly but please be aware that you only have one pair of ears. Industrial noise, gun fire, and lifelong ear problems is my baine thus sitting here typing with ringing in my ears.
from what ive seen the hole saw mod looks easy on u tube just get a new bit and some wd 40 and drill them things and yank em right out