Ford Fiesta Mk7.5 Rear Diffuser Upgrade

[L22EEW]

This is something on my to-do list, but I have a question. I've already got a twin tailpipe custom exhaust system fitted, the tail pipes do stick out somewhat further than the stock ST - plus they're slightly larger in circumference, 3" each!

My question is will I be able to change the standard rear bumper extension, for the ST style diffuser upgrade with the exhaust in place? I seem to think that the exhaust may get "in the way" when trying to fit the upgraded diffuser... <_<

I've seen the guide floating about on the forums, however the diffuser was fitted first, then the custom exhaust tip was fitted secondly.

[E5GDM]

I don't think it will get in the way, but even if it does why can't you remove the back box?

Also you'll need to raise the tailpipes up to the correct position, as at the moment they hang way low.