Dinan is a joke and I use to be a fan.
Their "warranty" is what people refer to to justify the high price but it is a load of crap.
I bought one of their exhausts a couple years ago. The fit/finish was horrible. One set of tips was longer than the other. I proved it to Dinan with pics and measurements. They agreed and then said it was within their manufacturing tolerances. It didn't fit either. I had to go to a custom exhaust shop to have the hangers bent, etc. to get everything to line up.
So much for their vaunted warranty. Buyers of any Dinan products beware ...
Current: 2015 F80 M3 (SS, Full Black Interior, 6MT, LED, Adaptive, 19's) - On Order - 10/28 PCD
Previous: 2013 E92 M3, 2013 F10 M5, 2009 E90 M3, 1998 E36 M3