Jason Hansen

2005 audi a4 3.2 non turbo
Auto/paddles/S 7 speed
Under load has a burble type noise slight restriction felt but can accelarate through it no probs any ideas?also hard accelaration a flappng type noise can be herd passanger side from back half of car does not sound mechanical all 4 02 sensors replaced no ecu faults no dash lights in park firm rev gives slight popping noise from exhaust (rear of car)sounds like a plastic bag flapping for lack of better desciption car does not lack in performance/smooth gear changes drives well all round just these ugly noises any ideas would be great