http://www.snowmobilefanatics.com/forum/topic.asp?TOPIC_ID=10348 snomo, please take your time to read this. are you jasper as well? not sure why you are even bumping this topic from feb posts.
forgot to add my answer ,
ski doo 500 are solid overall. basically same as SLS 500 around 90-92 hp.
and for 600 , there are few different verisons for 600. HO is about 114-116 while regular 600 are around 103-105 hp ( 500SS models use this verison ) hope this helps!
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