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The FM antenna is powered, so you need to connect that wire to a 12v power source. There is usually a spare wire on the wiring harness specifically for this.

You can get the gaskets from: Manifold to Engine - Gasket with fitting kit: https://www.importcarparts.co.uk/parts-info?id=12009 Manifold to Engine - Just gasket: https://www.importcarparts.co.uk/parts-info?id=12008 Manifold to overpipe / Overpipe to 2nd cat - Gasket: https://www.importcarparts.co.uk/parts-info?id=12010 No, you don't need to. You should only think about it if you track the car alot, but then I'd look at getting the manifold ceramic coated or have thermomet applied.

If you are going down that route put the 46 on the back. The rear arches are larger than the front and swallow up more wheel. I have 5mm wider spacers on the rear than the front to get them to look the same.

The first model year of the Aero (might be the 1st and 2nd year cars) came with the OZ wheels, which was a limited OEM run. After this first (or second) year Toyota swapped the Aero wheels to a generic 86 wheel. They weren't available to buy though distributors which is why you can't find any with a ET46 offset. If your looking to buy a brand new set, these are the wheel specs I'd go with: