i know that just wanted advice from some body hou is running that and can you still get good speed with the 13/41 ? i will be riding trails also hill climb and flat sand play my mods are pro designe filter with no lid complete t5 exhaust agressive port stock bore, finding the 15/41 slow to get up to speed but is fast, a bit of a ass to take off since the after market clutch so what would you guys recomend the 14 or 13 /41