When you registered your sled the first time, it was under the snowmobile act ( which has since been scrapped and replaced with the ORV act) when I re-registered my sled I received a credit of $30 towards the new registration. If you have already got the plate you can exchange it for the decal...
I went with Elka shocks this year, and love them! I can pound over woopdie doo's like nothing now, also, they keep the skis down on the trail when cornering too. I'll definitely be changing all the skid shocks to Elkas this off season.
I have a SLP can too, it pretty quiet with a bit of a rumble.