Why was I out driving? Only for this:



MagnaFlow 12580, 2.25" ID dual inlet and 2.50" ID single outlet. Stock exhaust was 1.9" O.D. out of each cat (so what, maybe 1.7" ID, yes even the flattened cross-over pipe which is actually two pipes in one!), and a 2.4" OD single inlet / single outlet muffler (so what, maybe 2.2" ID). I had the muffler shop open up the cat outlets to 2.25". So it's from start-to-muffler better flowing than stock. I did not make any changes to the exhaust after the muffler because I've got a big project late next month after which I'll replace the rear section of exhaust.

My goal was to have a much more free flowing system yet one that is incredible quiet. I am SUPER HAPPY with this muffler. It has a slight rumble at an idle and above 3K, both slightly louder than stock. At cruising RPM it is either as quiet or better than stock. It met my full expectations.