Buried away in the DFT (Department for Transport, parent department to DVLA and VOSA) Consultation Document, re: the demise of SVA and its replacement with BIVA, are the following questions.

For example, it is obvious that a larger bore exhaust or tuned engine could be seen by many to be detrimental to the environment. This is despite the fact that most aftermarket exhaust systems are manufactured to TUV / SVA standards of noise and that many tuned engines run cleaner than the factory specifications.
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