As the title, I have a magnex decat downpipe (2.5 inch) and a scoobyworld ninja backbox, again 2.5 inch. Will a deresonated centre section from milltek fit ok as it they do 2.75 inch?? Roadrunner motorsport say it will fit fine as they all come with a 2 bolt flange, is this correct as I don't want to get the wrong thing??

mike