While sitting around the TV a few nights ago, the subject of “modding” your car came up.

This is a subject dear to many, and of absolutely no interest to others. That leads to the inevitable question of warranty. While many modified cars are older than Methuselah, some brave souls do their new cars too, where changing engine management and other settings can give a boost. An extra few kilowatts can make all the difference in a dick-swinging contest.

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Modifications can be physical too. Turbo charging is a favourite among the jaunty-capped-chav community where bigger is better. Air filters and exhausts come in for attention too, with air filters like dinner plates and exhausts like paint tins. Bragging rights aside, they allege performance improvements.