Lives are being put at risk by young motorists who modify their cars to boost performance, says the AA.
The motoring organisation wants tighter controls for things like nitrous oxide kits which are used to massively increase an engine’s power.
AA Chairman Edmund King said: "We believe that many hundreds of lives are put at risk by these modified cars.
"Some 20% of new drivers have a crash in their first year of driving. If you then put them in a modified car that’s harder to control, that’s faster, that has an extra 200 brake horsepower, then accidents are much more likely to happen."
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