Do I need clamps, or does this come with hose barbs?

This is the hose only—no fittings or clamps included. Use barbed adapters sized for 2.75" ID with stainless hose clamps to secure each end.

Can I use this for coolant, boost, and vacuum lines?

Yes. The 3-ply silicone handles all three. Just confirm your application's temperature and pressure limits match high-temp silicone ratings before installing.

How do I cut this to length without the edges fraying?

Use a sharp utility knife or hose cutter for a clean edge. The silicone won't fray like rubber, but a clean cut helps clamps seal better.