alright guys im looking to building my bike a little. so far what i have in mind is a stage 2 cam with springs, some fcr 39mm carbs and a single exhuast for now unless i find a good deal on some duals. what would be a good single exhuast to run with this set up? sparks? barkers? thank u for ur help and please let me know if u know someone looking to get rid of some fcrs 39mm for a good price not to pricey. also doing this set up, would i bet some 450's? ltr's?