I'm looking for something a little louder than the super huge stock muffler on my truck. Has anyone heard/used either of these mufflers? The ultraflow is supposed to be a race muffler so it may be too much but I'm sticking to the stock 2 in 1 exhaust and changing to a better muffler.

 

I'll comment on the Ultraflow. I had one on my 2000 5.4 F-150 for 4 years. If you're looking for a little louder than stock, don't get this muffler. It's a throaty, muscle car sound that you can hear from a block away at certain rpms. Many recommend a straight-through design muffler on these trucks for increased power. Quiet versions include the longer Magnaflow and the Borla. You're not likely to get much feedback on the Edelbrock.

 

I had the Dynomax system on my 99 ec and I replace the original muffler in the kit with a welded Ultraflo #17220 it had a nice sound and wasn't loud at all.