Remaps are possible. Have a look at Performance Torque. Ayde Bury on here has used them.

Front grills are fairly easy to change. New grills can be purchased from dealers... (If you become a full member, you'll get 10% off of some parts)

It's possible to fit the armrest yourself. Depends how happy you are with tools etc.

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Seat Leon FR 2.0FSI Turbo
BMW Mini Cooper S
Black and blue all over