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

Yes. Silicone handles all three—coolant flow, vacuum pull, and positive boost pressure. Choose clamp size to match your hose diameter and tighten firmly to prevent weeping at the connection.

Do I need hose clamps?

Hose clamps are not included. You'll need two stainless steel clamps sized for 2.50" hose (typically 2.5" to 3.5" range clamp size). Worm-drive or band clamps both work.

Will this hose kink if I don't support it?

The 3-ply reinforcement resists collapsing, but avoid sharp bends beyond the pre-angled 45 degrees. Support long runs with zip ties to brackets or existing lines to prevent stress at fittings.