Stopped flagellating long long time
. Been out riding on this beautiful day.
STimpys right, EXUP was a thingamagigi, a valve of some sort developed by Yamaha that fits in the exhaust system and improves overall power and efficiency and adopted by other manufacturers. Way beyond my comprehension, one inlet and one exhaust in L configuration I understand
.
BTW Brian's it, if he can drag himself away from his STunning ST