Hi TBANGA,
I removed my rear plate and the next baffle in, from stock Speedmaster pipes. Then I drilled a 3/4" hole in all baffle plates. I consider it loud, but can't hear anything next to Harleys with Thunderheaders or similar pipes. Thunderheaders are very deep in tone, but not as loud as drag pipes like Cobra, etc. If ThunderHeaders were made for Triumph Americas (TAMS), I'd buy a set today, even though my bride keeps our Ccards maxt out.
Ride Safe,
Dennis
