Linz, your going to think im a right party pooper boring so and so. If the sh!t where to hit the fan, say, god forbid, you ended up killing someone, they would be going through your car with a fine tooth pick and your insurance would be void. Or say you end up proper smashing your car, all your thounsands of pounds worth of mods will be down the drain.
My comments only have your best interesets at heart. Little things here and there like dump valves or filters (come to think of it, even filters) you will probs get away with. Things like wheels, remaps, exhausts, coilcovers I would declare, just me tho.