What clamps or fittings do I need to install this?

Hose clamps are not included with this elbow. You'll need two stainless steel hose clamps sized for 2.00" diameter hose — typically worm-drive or band-style clamps rated for high temp. Size your clamps to match the barb diameter on your fittings or ports.

Can this handle intercooler lines or just coolant circuits?

This silicone hose works on both. The 3-PLY structure handles boost pressure in intercooler plumbing and sustained heat in coolant loops. Verify your application's pressure and temperature specs are within silicone limits before installation.

Do I need to prep or clean this before connecting it?

Rinse the interior with clean water to remove any residue from storage or manufacture. Dry it before connecting to avoid introducing contaminants into your fluid lines. Apply a thin coat of silicone-safe lubricant to the barbs before sliding hose clamps tight — makes installation easier and creates a better seal.