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Premium Member
2006 S/C Silver & 2006 S/C Pac Blue 6spd
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1,700 Posts
Thanks Mike, would your tips work the best?
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.

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.

Back story:
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.
 

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Premium Member
2006 S/C Silver & 2006 S/C Pac Blue 6spd
Joined
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1,700 Posts
Looks like it may have gotten nudged over against the side?
The exhaust system grows longer when it gets hot, especially when driving for a while, and then it pivots on the driver's side mount which is located more forward on the Magnaflow exhaust than the stock mount. I also recall the Magnaflow is inboard versus the stock being outboard, but the movement fore and aft is the bigger factor in movement and stability of the tip. In my opinion, it all makes difference. The reason the Maganflow exhaust doesn't use the existing mount is because their exhaust does not go outboard of the frame rail like the stock one does. When I had the "kick out" made for my exhaust so I could carry a spare, I went back to using the existing stock mount.

To Mike's comment above, the polished part of the tip that you don't see unless you are laying under the truck after they are installed, or staring at the last few photos of the tips on his website, are actually open to the incoming air vs. closed back down onto the pipe. This allows them to dissipate heat better.

I feel like quoting @SWT RYD here, and saying something about "...staying at Holiday Inn once", :LOL:, (so I will). But I have actually measured and studied the geometry and done some measurements🤓.

The drone experienced in mine was very likely due to a combination of removing the stock inlet pipe, which has a neck down just before the muffler, and less baffling in the muffler. I made the situation worse by installing a higher stall speed converter, but benefited greatly in the acceleration department. As stated many times in various threads GM did some significant work on exhaust system to get rid of the drone.

@DOOPHUS I respect your 2 cents worth. As we all know the exhaust sound is a personal one, hence I preface my comments with "I honestly like" and later on state "many folks run them and like them". That said, everyone liked the way mine sounded too, but they didn't ride in my R for hours at a stretch. I personally prefer the sweet rich smell and sound of my 454 with side pipes, but I don't fancy driving it across Texas without hearing protection :oops:.

@Baggerboy1969 - I did not answer your "best" question, as almost any answer is subjective. There is no "best". There are many folks that like the raspier sound of the stock tips and think those of us that have changed them have made the exhaust sound worse. I've that R owners tell me that directly. I obviously don't think so, but I respect their opinion.

Magnaflow makes a good product and they've sold many sets for the SRRs. They work fine in many cases and many people like them.

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