I have thought about the Milltek but people on this forum have said it's quieter than the stock exhaust unless it's coupled with HFC which I don't intend on doing !
I had the Milltek with stock cats - it only lasted one month until I replaced it, as it was SO quiet. Made the car sound like an electric car IMO!! Sold it to a member on here who paired it with HFCs or decats, and I think that has really brought them to life with a fantastic sound.
Stop your search now and get the Ark Grip - you wont be disappointed. Growly at WOT, silent when cruising.