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Your warently is only invalid on the parts youve moded and affected by the mod and can be proven to have caused the failure.
So for example if you go stick bigger wheels on the car and you want some work on the heater then warently is still valid however if you have bigger wheels and you wheel bearing goes and it can be attributed to the bigger wheels then its not warented.
However dealerships know the deal, if they refuse work they have to prove under EU law that the mod is responsible and they cannot be bothered both with the work to do this and the bad publicity.
Any intake/ exhaust work I would imagine would be no problem for a dealership with warently work.
Well am only puttin a set of Mk2 172 16s on anyway so its not a massive increase in wheels size from standard n al prob be keepin the 15s i got with the car so if i get any probs with bearings etc al just stick the 15s back on n take it back to renault.