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.
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.
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