Upgrade the 400

[dannyboy20]

ok i need some opinions. I have a 400 pretty much stock except the kand Nfilter. I need this thnig to go faster. What would be a good upgrade for under 500$

[4TraxRider]

Pipe and jet kit.

[heavy]

grind the weld out of the exhaust pipe. Improves flow bigtime. rejet and repipe after. :D