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taken from 7mat's post on renaultsport forum and very well put imo:
It is only a legal requirement for manufacturers to release cars with cats fitted.
Removing your cat is not illegal, and is not a valid reason for an insurance company to walk away from a claim. Although not reporting...
green and itg panels seem popular!
i know it aint a mk 1 but i had a itg on my 182 and it was a lot better than an open filter for performance
not sure how to mod a mk1 airbox but improving the air feed and flow to the box is what you need so perhaps bigger openings and maybe a few drilled...
mine is -60mm but on 16s
it all depends on if you roll the arches or take the arch liners out! u should be ble to go -40mm without doing anything but if you go -60mm you will probably have rubbing issues with the 17s