Hi Celt,
After you drill your little holes, get a hammer & chisel and whack away at the second baffle. Get a few shots of Johnny Walker Black Label and go after 3 & 4. It still won't be real loud, but much deeper exhaust note. My wife hates, I mean HATES loud pipes. She has commented several times on how good my motorbike sounds. My endplate is gone, along with the next three plates in. I have a ¾" hole in the rest of plates. If I can find another set of 99¢ pipes on ebay, I'll remove everything but the fron two plates and their connecting tube. That way, it will have plenty of backpressure, and the gas expansion into a large void which is needed for a deep exhaust note.
Ride Safe,
Dennis
