Hey Ben,
I have stock Speedmaster pipes on my '02 America. I got them last November on ebay for 99 cents + $20 shipping. I drilled a 3/4" hole through all the baffle plates, using a 3/4" rotary file (it don't take long - baffles are real thin). Remember that each two baffle plates are connected by a 1/2" tube. I think there are four connected pairs of baffle plates. If I had it to do over, I would have left the front two plates and tube intact to provide backpressure and allow expansion of gasses throughout the rest of the pipe. That will create a lower tone also and plenty loud for me. I have a high frequency hearing loss and like I said - they are plenty loud. So, my recommendation would be to remove the baffles starting at the rear, and work your way forward until the last ones are visible You should have removed 2 or 3 pairs of plates and their connecting tube. Forgive me for not remebering exact number. Shouldn't be too hard to tell, once you see how they are installed. I used a 3/4" rotary file to drill into the tubes and broke them off (out), then proceeded to the next one with two extensions of 6 and 12 inches. The America pipes are more open on the ends and give enough access to use a bimetal hole saw, which can be obtained at Lowe's or Home Depot (or a real hardware store). Then rejet to 125 mains and open your pilot screws another 0.5 to 1.0 turns out. Order a pair of 130s and 132s from Brent at NewSpeedmaster.com also (they are a great cheap mod). You may also need to remove primary snorkel and/or secondary snorkels in your airbox to finish you balanced flow.
Hope you get what you're listening for. Use Specialty Spares exhaust if this don't work (other great ones are available, but appear way too loud or too shallow). I promised Dale that I would buy a set of his pipes when I got the money. Be sure to balance your carbs after any and all modifications to jets or air flow.
Please Ride Safe,
Dennis
