Yea I'd say 144. I'm going to have to stud my sx also. Previous track had 144 but when i bought it, it was missing three windows in a row [:0] There was no way I was going to ride it like that so I put some new rubber on her. After riding it for a year, some close calls, I think its time to do it. Doing a 360 on a lake on glare ice by accident while doing 50 mph, isn't as fun as it sounds. Lucky I didn't flip her or I would of been pretty upset. Tunnel protectors are pretty easy to put in. Like what was said, you drill 4 holes, and rivot them in. CAREFULLY ! don't drill through the heat exchanger. Its happened before. IF you know someone who can weld aluminum, you're okay. I don't know about your sx, but mine will run with the SRX's, and without pics it doesn't hook up the best thats for sure.
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