@makesubarugayagain it's a UK thing. All BRZs and GT86s came with a bottle of sealant here. I've been for a bit of a drive with it in place and it seems well clamped down so far.
You gotta kinda wonder what sick son of a bitch at the battery factory decided they should include a pictograph encouraging you to taunt children with a CR2032…🤷♂️
@makesubarugayagain According to the website you can just change the manifold (headers) for their turbo one and the rest of the kit is compatible so makes sense if it looks similar to a turbo setup.