I think the biggest turn off is that one has to cut the stock piping of the rear muffler. Dinan should make it with the flange so it bolts up to the midpipe, which is what pretty much most other aftermarket solutions offer. I actually am a fan of the Dinan sound because I find their exhausts (at least the one I had on my e92 M3) do not drone, which IMHO was a huge improvement over the Gintani and Eisenmann I had on the M3. I would consider swapping out my Eisenmann Race on the 1M for the Dinan, but only if it involved no cutting (and if I do indeed keep the 1M).
2012 Audi R8 V10, 6MT, Suzuka Gray, Larini Clubsport exhaust, GMG springs, Satin Black badges
2012 Audi A6 Prestige, Moonlight Blue
2009 Lexus ES350, Sparkling Graphite
Previous: 11 e82 1M, Several 911's & M3's