We're UK based Milltek dealers and we have now sold 5+ Milltek full systems for the 1M.
I have the full Milltek primary cat back non-resonated system on mine and it sounds wonderful
. There are various configurations available (most of which we have in stock) all offering slightly different benefits / noise levels.
If you are ever in the Cheshire area and want to listen or have a trip out in mine please just give me a shout on 01270 567177 to check that me and the car will be here.
With regard to Milltek quality we have been a dealer for around eight years now selling well over 500+ systems and we've only ever seen 3 warranty claims which were all dealt with by supplying brand new replacement parts so excellent customer service and original purchaser lifetime warranty.
Cheers, Chris