Do I need hose clamps to install this?

Yes. Clamps are not included — grab worm-gear clamps or T-bolt clamps sized for your hose ends. Tighten snug enough to prevent weeping, but don't crush the silicone.

Will this work for coolant, boost, and vacuum lines?

Silicone handles all three. Just verify your system's pressure rating matches the hose specs before committing it to a boost application — most silicone hose is good up to moderate boost levels, but always check the max pressure for your specific line.

Can I use this hose right out of the box, or does it need prep?

Install as-is. No cleaning, priming, or treatment needed. Just dry-fit it first to confirm the taper matches your existing hose diameters, then clamp it down.