Can I weld this, or does it need special prep?

Aluminum can be welded with proper equipment and technique. Clean any oxidation with a wire brush or scotch pad before welding to ensure good penetration. If you're using this for exhaust, seal welds with high-temp epoxy or exhaust sealant to prevent micro-leaks.

Will this work for both intake and exhaust runs?

Yes. Aluminum handles both applications. For exhaust, monitor the tube occasionally since it's thinner-wall than some steel alternatives — vibration clamps every 12–18 inches keep it stable and quiet.

What if I need to cut or re-bend this bend?

Aluminum is malleable and easy to work with a hacksaw or band saw. You can re-bend it cold with a pipe bender, but be gentle — aluminum doesn't have the flex recovery of steel. Test small adjustments before committing to a major reshape.