Funny Noise from MY99
 

Hi All

Can anyone help i have a strange sort of quiet fluttery feathery noise (forgive the scetchy description) coming from my scooby when i accellerate, the noise is not present on tick over or when revving the engine when stationary only under load. My feelings are possibly a small exhaust blow but before i tackle removing all of the heatshields has anyone got any other thoughts?

Cheers Paul