A couple of reasons......every body puts em on.....I dont think I have yet to see a mustang with anything but
I also dont like the sound they
can produce. Alot of times you get that wonderfull flowmaster resonance with the flowmaster sound.....sometimes not. Sometimes they dont sound bad though, I will admit.
Now to my big beef with them. They are one of the worse flowing performance mufflers out there. Ever notice how flowmaster dosnt publish flow numbers about thier product? Kinda makes you wonder why dont it? Now there are some deccent flowing flowmasters but those variety are really loud. Now they probably aint restrictive enough to make a difference in a stock 350 truck motor but still i dont like em.
I prefer dynomax or magna flow or spintec or straightline or Borala. I prefer the striaght through design but I cant argue with the flow #'s of a spintec
Actually I think my main beef with flowmaster is while God was resting on the seventh day the devil created tomatoes, flowmasters, Janet Reno and a few tree hugging hippy liberals