Need help 05 ski doo rev800

I have a 05 rev 800 151 track my dad has a 159 2.5" track he sed I can have but I have to go to a 9 lug driver he told me he took it off his sled becouse it made it not have enough track speed im wondering what are the stock gears in the chain case,
What size of gears you guys Recommend to bring up my track speed for the 159" with 9 lug driver and what site I can find the diffrent sizes of gears and chain sizes to buy

Need help 05 ski doo rev800