There's no poke without smoke!
Just got my milltek decat downpipe installed on saturday. It is connecte to my milltek catback res. I'd go for the milltek myself mate. at least you know that is is going to connect to your existing catback with not too much hastle (no cutting or extra pieces to change the diameter). The milltek downpipe is a 2 piece job.
Stage 2 Custom code Remap, BSH Trueseal CAI, Milltek resonated decat Turbo back, Platinum grey wheels.