Do I need to seal these tubes before installation?

Depends on your setup. If you're running coolant through the intercooler loop, you'll want to pressure-test the assembly first and apply appropriate sealant or clamps at connection points. For boost-only applications, hand-tight fittings usually work, but verify your turbo kit's specifications.

Will these tubes fit my intercooler cores directly?

The 2.50" diameter is a standard size, but your specific intercooler inlet and outlet sizes determine fit. Measure your cores before ordering. Some cores use 2.5" ports; others vary. Test-fit or consult your intercooler documentation to confirm compatibility.

Can I bend these aluminum tubes myself?

Aluminum can crack if bent incorrectly without proper equipment. A tube bender or professional shop is recommended if you need custom angles. Straight sections from this kit work well for most bolt-together turbo kits with minimal routing.