Yz426?

[DLpimp4lyfe15]

What exhaust will give the most power for a Yz426f motor?

[BlingyLTR450]

already has a good exhaust. change the header your basicaly just swaping power around more low less top or more top less low. Most hp gain your going to get is like 2hp. I ran white bros R4 and liked it. Never used the stock exhaust.