Why does my Peugeot 405 seem faster, as well as more noisy?

I have an N-reg Peugeot 405 TD and for the past week the car has got a lot quicker, but this has come with a noise during boost. What would you say it was?

Asked on 9 September 2010 by bryn roberts

Answered by Honest John
Maybe the air filter has disintegrated, so it's breathing better but more noisily.
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