Magnaflow = happy
#1
#2
2nd the Magnaflow
Same thing here. I just put the SI/SO Magnaflow on my 04 with the 5.4. I had a similar SI/SO Flowmaster setup on my last truck, a Chevy 2500HD with the 6.0 but I didn't want this truck quite that loud this time. I went with my muffler guy's recommendation and did the magnaflow. Very happy with the results.
#6