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The car isn't modded and I don't intend to yet, as I've just forked out on insurance and Road Tax this week.

Is it possible to put on different sized tyres without modding your car?

Not totally sure on your question mate, care to re-phrase?

The first part of your tyre size is incorrect - '1675', is that 165?

You can purchase other sized tyres to fit your wheels no problem. You could alter the width or profile depending on what you itend to do/achieve with them.