Is there any oem 136 tunnel that I could put on my pro x to eliminate having an extension on it? Who makes 136 rails for the pro x? I am just thinking that it would be nice to eliminate the extensions and be able to go longer for the mountains. Also, for the mountains is there any mountain skid that would work in this sled to get some weight down?

on the skid you could go to an ez-ryde, should save about 20+lbs over the pro-x skid... if you want a complete tunnel, imho, you call VanAmburg Enterprises... some say fabcraft but i'd take the VE over the fabcraft any day... personal preference...

"Nice" yes, necessary or cost effective probably not.

polaris makes a 136 rail kit for the prox. tunnel like bonz said ur best bet is probly VE unless u fabricate your own

Buying the rails would be good because I can go longer with extensions but I probably wouldn't need a different tunnel I guess. I could just use bigger tunnel extensions then.

Used to be able to get it as part#2874236, (pro-x,'01-'04) incl'd rails skirts and hardware. Picture of kit showed cooling rails and and rear cut-off, kit listed at $349.99 Just had to come up with choice of track.