I have a standard zorst and on tick over all sounds ok. when accelerating the zorst makes sorta ticking noise.the noise seems to come from the footwell near where the cat and the front pipe are. the noise gets louder the harder you accelerate. this noise has been there from day i bought the car but got really loud after today after i had the centre section replaced due to it been knackered. just wondered if anyone knows what it is or could be . colin