Do I need a bolt to tighten this clamp?

Yes. The V-band clamp requires a single fastener to cinch down the band and seal the flange. Bring your own hardware rated for exhaust temperatures — typically a stainless steel bolt in the M8 or M10 range, depending on clamp design specifics.

Can I disconnect this clamp without cutting or unbolting my exhaust?

Absolutely. That's the whole point of V-band design. Loosen the single bolt, slide the band off, and separate the two flanged tubes. No welding, no cutting, no permanent commitment.

Does this clamp work on both OEM and aftermarket 2.5" tubing?

Yes — as long as both the inlet and outlet tube have matching RM12-2 flanges and are 2.5" in diameter, the clamp will seal them together. Check that your flange style matches before ordering.