Welcome to the site...
"SV's for dummies", Part 1
The can is welded to the link pipe, so you have the option of either fitting a complete system, or cutting the can off of the link pipe. I think CCC may do a "long" link pipe, that will replace the standard unit.
Forks - Their ****e... There's a few things you can do, but easiest and cheapest is to upgrade the fork oil. Somebody will be along and advise the best weight to use.
There's a whole list of other "simple" mods, but I'll let somebody more experienced give them to you in part 2
And good choice BTW, 400's are great on the track but hard work on the road.
Oh, and my son will be 17 in May, he'd love an RS...
.