Check my Evolve exhaust thread if you didn't already. The very reason why I love this exhaust is it really is very refined and civilized when you don't push the throttle and it is really loud and killer when you want to get things heat up, especially after around 4000 rpm. It is the real Dr. Jekyll and Mr. Hyde exhaust (without a button or so managing that) which I was looking for and it keeps on getting better with every mile.
There are small pops and burbles all around the range, cold start is awsome and loud and drone is infinitely better than the stock, both in intensity and range, I don't even count it as an issue anymore. I had a huge drone between 2000 to 2900 rpm with stock.
It also doesn't get that metallic raspy sound at the top end of the acceleration like some other exhausts do. I love some other exhaust sounds as well (Lightweight, Meisterscaft etc.) but for the price this just seems to be flawless imo. I wouldn't change it to anything, louder or not.
"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
2011 BMW 1M: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, P3Cars, OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.