yeah, im running A B303, it sounds ALOT bigger than it is, Great NON-S/C cam, but i wouldnt go with the E303 "FRP crate engine" even though its better for your S/C application because of just the sound diffrence, sound does matter and the B303 has that from my view for its size...but to answer your question, i would just search Google, i searched there and found a few clips, hope this helps-
Hers mine B303 on a otherwise stock motor with full bolt ons. Its not very loopy but Im sure it would sound meaner with H/I. The mic on my camera sucks, its much louder in person.