IMO Milltek FTW!
Over the past 16 years I have fitted 1000s for exhausts from every supplier out there, oem, patern and performance systems. And I can honestly say that Milltek have hit the nail on the head, quality material, good bends, sleave joint which fit perfect and dont need any sealing paste, good fitting not had one yet with a bad bend. They are a pleasure to fit! There back up and support are very good, Then the LIFE time warranty tops it off.
They are not as loud as some makes, but I come from a tuning back ground and know noise dont = any extra power, just ditry looks from OAPs.

Yesterday we did a full 1.8T Turbo back install on behalf of Milltek for a car magazine, at the same time had a photo shoot while installing the system and carrying out back to back rolling road runs. Using Our spec1 AUM remap back to back dyno runs and with a Milltek res turbo back made an extra 21lbft.
Nick