Can't comment on the ST3 performance, but I can about the ST4S.
One word...........AWESOME!
Tons smoother in the power delivery, even power across the band, quite a bit of lower end improvement, top end gain, fantastic sound, and 3rd gear passing (mid-upper range) power is a HUGE gain. (I am talking about 50-90mph in a heartbeat!)
One word...........AWESOME!
Tons smoother in the power delivery, even power across the band, quite a bit of lower end improvement, top end gain, fantastic sound, and 3rd gear passing (mid-upper range) power is a HUGE gain. (I am talking about 50-90mph in a heartbeat!)