Do I need clamps to install this hose?

Yes. You'll need hose clamps sized for both the 3-inch and 4-inch ends. Standard worm-gear clamps work fine—just confirm your clamp size before ordering.

Can I use this hose for coolant or only boost applications?

This hose is rated for both. The 3-ply silicone handles coolant temperatures and pressure equally well, so it works in radiator loops, intercooler setups, or custom plumbing.

Will this hose fit my existing fittings without adapters?

Depends on your current setup. The 3-inch end will slide onto any 3-inch barb or fitting; the 4-inch end does the same. If your fittings are a different size or style, you may need adapters—measure your barb diameter before committing.