don't bother, i never declared anything on my previous 8 valve, had coilies, k & n, full exhaust system, power boost valve, speakers, etc. anyway a girl smashed into the back of me, wrote it off, the engineer guy came to look at it, i poo'es my pants thinking he'd say i wasn't liable for any money etc, but he didn't even bother to look under the bonnet! when i got it taken away i claimed 'you can't drive it as the clutch is snapped' the real reason was i took the induction kit off, half the fuel rail as i ruined it taking my power boost valve off. and so they towed it away, once again not even bothering to check i was telling the truth. so i got the insurance money and bought a newer 8 valve

the moral of the story is all the insurance companys care about is money! if you don't declare your mods they don't care. if you do declare them they say 'ha ha look we got more money out of them! they fell for the mod trap!' so i would just not bother!

unless your your doing a turbo jobby, or a 2 liter jobby then yeah i would!
by the way if you don't belive me ask alex, the guy who's posted the 'cupra gti project' other wise known as fenix, as it was his girlfriend that wrote my car off!