Do I need hose clamps, and what size?

Yes, clamps are required to secure both ends. The 3.50" diameter calls for large-diameter hose clamps — verify your clamp range matches before purchase. Hose clamps are not included.

Can I use this for both coolant and boost applications?

Silicone hose is rated for high-temperature coolant lines and moderate boost pressure. Confirm your system's pressure spec matches the hose rating before installation. If you're running extreme boost or high-PSI fuel lines, verify compatibility first.

Does the 45-degree angle lock in place, or can it be bent further?

The hose comes pre-molded at 45 degrees but retains some flex. Light angle adjustments are possible during install, though forcing it significantly beyond the molded angle risks kinking the reinforcement layers. Work with the intended bend where possible.