Gas Mileage???

brasil said

So for the next step...I think I will buy some Aluminium heads.. because here in Germany we can not install Water Injektion legaly....

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How do they regulate something like that? Do you have inspections where someone looks under the hood of your car? That's the only way someone could catch it. Also do you know why it's illegal? I can't think of a good reason why... Just wondering...