Will this filter work in my factory air box without any modification?

Yes. This is a drop-in replacement designed to seat directly into standard GM air box assemblies. No drilling, cutting, or adapter brackets required.

How do I know when this filter needs to be replaced?

The red panel makes it easy — dirt buildup becomes visible without opening the box. Once the surface looks clogged with dust or debris, it's time for a fresh filter. Most drivers replace every 12–15k miles under normal conditions.

Does this come with any gaskets or sealing hardware?

Filter element only. Your factory air box already has the gasket and mounting frame in place. Just slide the new filter in and close the lid.