I donít think anyone should panic.
Speeding is a common offence, noisy exhausts far less common.
There would have to be a monumental moron in government to spend £X millions of taxpayers money developing and installing a new acoustic camera system that wouldnít be recouped by the relatively small number of fines issued.
OK, Iíve talked myself into it. The probability of that monumental moron actually existing has got me panicking, but more as a taxpayer than potential offender.