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Since when is installing a straight pipe legal? This is an extremely common modification. By doing so you are putting out toxic chemicals because you removed t

• gambiting 8y ago
  It is legal if you get it re-certified - you car will most likely receive a different tax band because emissions will go up(or be refused certification if it goes over allowed limits). I think there's some misunderstanding here - even in the super-strict-and-bad EU you can build a car in your shed and get it registered and drive it. But you can't build/modify your car to be against regulations, be it emissions/noise/pollution or whatever else. As long as it's within the allowed parameters, then knock yourself out - there's a thriving modding scene even in countries with insane regulations like Germany.
• kurtisc 8y ago
  That's a non-sequitur. One modification not being legal in your jurisdiction means nothing for other modifications. If you want to get more than a few thousand miles out of a car, you'd better be willing to modify safety-critical parts of it by replacing the brake pads and tyres - plenty of people do that themselves.