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I've had a Flowmaster muffler on my 240 for about 12 years. I bought an MSA 6-into-1 header, their 2.5" stainless kit (with DynoMax muffler) and had it installed by a local shop. I didn't like the DynoMax muffler too much, and it was occasionally rattling, and after a few tries at the original shop to fix it, I took it to another shop. I had them put on a Flowmaster, and they did a few very minor tweaks to the piping so stop the bumping and rattling. I liked the sound better, and it served me well for awhile. About a month ago, due to ignition issue I was having (long story, suffice it to say don't use a MSD Blaster II coil with a Pertronix Ignitor) I had a very loud boom of a backfire one day and the Flowmaster was damaged a little. Somewhere inside of it, some baffles or chambering or whatever got blown out of bent, resulting in a bit more of a "hollow" tone. I didn't have any visible damage that I could see without putting it on a lift, but after a few days I started to think it was leaking a little. I've always wanted a "twice pipes" setup, but that wasn't in the cards for now, so I tried finding a single-inlet, dual-outlet muffler that would fit the bill in terms of outlet size, orientation, and overall muffler length. No dice. I started looking into MagnaFlow mufflers, and sure enough they have a normal oval muffler in the center-inlet, offset-outlet configuration I needed. I read on this forum and others that MagnaFlows are a little more quiet than Flowmasters (but flow better) so I wasn't sold on a direct 9"x12" oval replacement. I did a little more research and found a 6" round muffler with offset inlet and offset outlet that I thought would work. I figured it was a little larger than the 4" or 5" round ones that people say are too loud or drone without a resonator. Plus, the muffler shop guy thought the offset/offset configuration might work pretty well without major bending/finessing, so I ordered one from Summit (part # MPE-12636). Sure enough, it was a great fit. Only took a half hour to swap the mufflers, fit the new slash/cut tip, and weld everything up. I love the sound. It's quieter at idle, and maybe quieter in the car overall, but it's louder outside the car to the rear as the RPMs rise. It definitely sounds more like a sports car now. I compiled a before-and-after video and put it on YouTube (see below). It sounds different under load that when just revving, but you'll get the idea. Under load, it starts off sounding sounding like an "angry trombone", and then moves into "angry trumpet" territory at mid-to-high RPMs. http://youtu.be/jXrf_ORXThY