Quote:

The restrictions are,in order (in our opinion)
1. Pipes
2. Cams
3. Ports
4. Airbox


Thanks for passing that opinion along to us Graeme. I'm another satisfied TB muffler owner who appreciates the optimized scavenging they provide. I have been puzzled by the fascination with airbox mods when the valve lifts-durations-overlaps are the limiting factors with the 900's.