I have recently fitted a WEPR external TD04 kit with screamer on my automatic and it's not a good idea. It all fits (with some squeezing) but the screamer pipe points directly at the gearbox and more importantly the rubber feed pipe between the gearbox and the radiator. For a while it's fine then one day BANG! the rubber pipe splits and the gearbox oil empties in seconds. If you could make a shield or re-route the pipe then you might be onto a winner but instead I am in the process of converting to manual.