I like Magnaflow. I had a single in dual out on the Bronco in my sig, sounded good all 5 years it was on there. Went with a 3" single in/out Borla on the Tahoe, it burned out in 3 years and started sounding like crap with lots of highway drone. Replaced it with a 22" case 3" Magnaflow and I like it a lot more. If you want loud though, go with Borla because it will only get louder over the years

Here is a link to the sound of my Tahoe with the Borla Pro XS muffler fresh on it... Click on 03 Tahoe Z71, 3 links

 

Between the two, I like the Magnaflow better. Performance wise, they are real close. I just like the way the Magnaflow sounds better.