i got some t-6s for a good deal, put them on & shee ran tons better. i have .30 over barrels, 30mm pwks, vf3s, the t-6s & stock gearing. but got beat by a mild ported stocker w/ t-5s & stock carbs. the dude let me ride his bike & it pulled hard. confused? im not a beginner rider, no mis shifts.