I went with a -2 i almost went with a -1 thinking a -2 would be too much but turns out this was perfect. Motor wise I'm bored over .30, 21cc domes in a fast racing cool head, chariot banshee intake boots, v-force 3 reeds and CFM performance aluminum airbox. If I did anything else it'd probably get it ported and polished but as it is now on the dry hard picked tracks it's still hard to find traction at times. When it's been prepped and it's nice fresh dirt that's soft it hooks up amazingly, so I don't feel the need to up the power anymore. I'm not racing anymore so it's somewhat rare when you do get a nice peeped track like that to put the power down otherwise I have to somewhat work to put it down. Nothing like how it used to be with the stock swingarm though.