I installed the magnaflow 12588 (5x11x22) muffler about 4 weeks ago. This is the same one in their cat back system and I just wanted to let everyone that this was the perfect muffler for me. I have the factory dual exhaust. I commute about 45 minutes one way and I wanted an aggressive muffler but no drone. You will not know it is there when cruising, but it has a deep growl on take off or heavy acceleration. My wife was glad for the no drone as well due to my gibson on my last truck being so loud. I know this thread is worthless without pictures or videos, but I am very limited in the technology department. I just wanted help people who were on the fence about wanting an aggressive , but not to aggressive exhaust. Furthermore, I also have a y pipe and I removed the resonators. It is also getting deeper everyday. I love it. I hope this helps for someone on the fence about a muffler.

 

Probably real similar sounding to the Mufflex 24" kit which is a bolt on Magnaflow. That's what I have, same results.

 

What are you driving? Model, year, motor, etc...

 

09 ram 1500, 5.7, dual exhaust

 

How does it sound when the MDS kicks in?

 

It is quiet with both mds on and off. It growls when you take off or get on it a little bit. It is breaking in nicely and the rumble is definitely deeper now. I am very happy with it.

 

I'm off work tomorrow, and will be installing the Mufflex 22" kit which is a bolt on Magnaflow I hope I'm as happy with the sound. I plan on leaving the resonators on at this time. Won't worry about the MDS already programed the SC not to use it any longer. Should help with my performance a little, I don't know about help with gas mileage.

 

Just had my 12588 installed on my 2011 Laramie Crew at my local garage. Had $223.00 total with the muffler purchase and install. Had one on my 09 ram sport and loved it.