All cars under a certain age MUST have a third brake light, you can buy them at places like Supercheap and there are probably wires already under your parcel shelf (in the boot) or look for the original plug that went to your old boot spoiler and run it off there, make sure the pod filter is secured and it's legal, find a standard exhaust and swap it with yours if it's too noisy or got no cat and like above take it over and fix the list they give you.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.