I've been shown recently that the milltek systems are the worst flowing systems out of the lot. they may sound nice, but for performance gains they are poor. Scorpion and BCS are the 2 best systems to use for power gains, even though they may not sound as good.
I've had milltek before, but I do prefer scorpion imo.
Never had any dealings with BCS - I know they get good reviews but I'm sticking to what I know in this case. Scorpion Downpipe is ordered and should be here tomorrow.
May look at BCS for a Cat-back system. Any links to online web stores for BCS?