I’ll say this, many of us run Mike’s tips and are pleased with them. I have Mike’s tips on a Magnaflow cross over muffler cat back system, and I have them on the stock muffler and I honestly like the stock muffler sound over the cross over. It has a deeper rumble.Thanks Mike, would your tips work the best?
What many folks don’t appreciate is how much the exhaust system moves under normal operating conditions and especially with heat. The when the exhaust gets hot, the driver’s side will move a lot. This is especially true with the aftermarket catback as the mounting point is relocated and the pipe is shorter. A lot meaning, 1/2” or more. The passenger side far less so, as the Magnaflow system reuses the factory mount, which is much more resistant to side to side movement or really any movement compared to the drivers side.
With a cold exhaust, independently try and shake the exhaust tips and you should see the driver‘s side move more, even on a stock R this is true. I found the rubber mount used by the Magaflow system to be softer, and switched back to the stock rubber mount.
I’ve got both a Magnaflow cat back and the stock exhaust and I ended up flattening the Magnaflow pipe as it comes by the pan hard bar to relieve a rattle of the exhaust against it under certain conditions. Later on I had to have it changed to put the same bend around the spare tire area, so I could carry one. Since I got the opportunity to do it over again, I kept the stock exhaust pipe configuration on our second R.
I ran the Magnaflow cat back with the 15843 setup, I forget the muffler # at the moment, and many folks run them and like them, but I really disliked the drone. I especially disliked the setup after I changed the torque converter, as it put the engine rpm at cruising speeds right in the drone zone. I too have burned my rear facsia on the driver’s side, but that was due to a different temporary issue. I ran the 15843 setup for years and grew to accept it. However, I then decided to split the Y-pipe and try the Magnaflow 12568 and see what happened. I greatly prefer the Magnaflow 12568 cross over as it drone is gone and it flows better, but it will actually decrease the mileage by about 1-1.5mpg. With the 12568 we can talk in normal tones at freeway speeds, unless my right foot is down.