No.

If you buy a Stage 1 you get a replacement top for your air filter, to replace your snorkel

If you buy a stage 2, you get a replacement air filter

If you buy a stage 3 you get a replacement side for your airbox, that has another filter fitted in it.

You can, use a Stage 1 with a foam air filter if you wish, or a K&N, or any other type of filter, including the original.

A stage 2 can be used without a stage 1, but I wouldn't really see the point.

You will also need to either fit a Kev-Mod or a PC-V for the Stage 2 and Stage 3

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