Whats the difference between the KTM SX and EXC?

Just about everything, following is some differences between the 450 SX and 450 EXC.

The EXC is a 6 speed with a dry weight of 252 lbs, compression of 11.9:1, electric start and is street legal.


The SX is a 4 speed with a dry weight of 231 lbs, compression of 12.5:1, kick start (09 450 is e-start I believe) and is not street legal.