Did the install today. Sounds amazing--very "nasty" in a nice way! MY12S built in Nov 2011 DOES have the middle resonator pipe. We replaced that with the Larini pipe and then the muffler. Weighed both and it saves almost 20 lbs. Got the valved one and interestingly, valve on/off does not make much difference in the sound--certainly not relative to the stock muffler. At idle it is fine, on the freeway cruising at under 3k rpms also about same as stock. On hard acceleration it sounds just fantastic. Shinoo took video both in and outside the car and will post on his site Welcome to Sector 111, home of Lotus Elise Aftermarket Performance Parts and Exhaust Accessories.. Shinoo and his team were fantastic to work with. There was one surprise which I will try to get up to show, but essentially the diameter of the rods that attach to the mounts on the stock had a welded "collar" on them such that they were about 3x the diameter of the larini (about the size of a pencil); Had to essentially get these off the stock muffler and get them on the larini--guys did a great job and worked fine. Hard to know if Larini screwed up or if Lotus just changed it and nobody knew. Either way, something to consider is that you may have to get the diffuser off and check this before you know for sure. Shinoo is in contact with larini to let them know. Good news is that everything else fit fine. Larini supplies a longer tube to actuate the valve since the location is just a bit different, but again worked fine. Oh, and finally lots of pops and burbles when you come off the throttle. Nobody will believe that this thing is a 6 cylinder from a Camry. I really like V8 engine sounds, but this thing sounds almost as good as my Ferrari 355. I am thrilled. Now it sounds like it performs. I will try to answer any questions and will post some pics, but thought I would get a quick summary up.