I fitted a Milltek cat back in November, bought from K-Tec. was changing the rear hangers a couple of weeks ago and noticed that the welds on the two back boxes had started cracking. Called Milltek, they admitted that there had been a bad batch. Next morning I had a brand new back section delivered under warranty (the centre was good,different batch). I noticed a big difference in the welds on the new section.They also gave me a de-cat pipe as a good will gesture.Cant fault the service and have a few mates with Millteks on various Audi and Porsche with no issues. It's not the fault that you remember,but the manner in which a company deals with your issue. So full marks from me.