[brnr17]

i want to extend my polaris from 121 to 136 ... i was wondering if you have to put cooler extensions in and what the best tunnel/rail extensions are

 

[driftpounder]

SLP or the tracks USA extensions work will, most people I have seen have either of these. i would put the heat exchanger extensions on just to get better cooling. you will be pulling more track causing more heat.[]

 

[bigrok]

tracksusa has a kit that includes tunnel and rail extensions and a 1.25" ripsaw for $350-$400.

 

[proxJ]

I ride pretty hard and there holding up good, i love it would never own a 121 again, its the same extension for my prox as your xc.
[attachment=51178]
[attachment=44752]

 

[700PROXDEMON]

I run rail extensions that are basically the same as the SLP ones. I never put on the cooler extensions, but I ride 95% fields and basically no trail. Plus with the 1.75" lug it throws alot of snow up there and I have never had a heating problem in any temp range.