I extended mine to 128". I think it's a perfect length for trail. If you venture off trail more offten than not, the 136" would be the way to go. Even though it's only two or three additional lugs on the snow I really think thak it has more to do with the overall balance. I don't want to throw a 136" track around in the tight twisty's, it's enough work with the sled as is. I also went with the 1" Hacksaw (Cat Version), great trail track, I've even ventured off trail a few times with no issues, but I don't have stock skis either (Curves). The Hack currently has about 4000 miles on it and frankly it looks brand new. My friend just changed his out on his F6 at 10,060 miles. It was tearing studs and just time to turn it in. Anyway nothing other than the rail extensions needed for the 128" which is why it's an easy choice for me, I used the kit from Ulmer and would recomend it to anyone. I was planning on changing the track anyway, I was going to get a great deal on whatever track I got so figured my not try something different. Glad I did.
I thought that was an S.E. as I didn't think any other 09's came with the blue A-arms. Great deal, looks very clean and ready to rip. Does it have reverse? That snowflap may need a strap to hold it up if you plan to use reverse, I like it though, I'm sure anyone behind you would also apreaciate it.