Most cars that have 3" don't need it. 2.5" is fine for most cars. As far as sound, it's subjective. No flowmaster equipped mopar I've done ever sounded like a 5.0...lol. And if you think they soun like glasspacks, you've never really heard a set of glasspacks on a real car. Totally different tones and character. I bent custom exhaust for over a year and you can design in a bunch of tonal qualities if you know what you're doing. Most shops now dont. I grew up with those 5Ls and I can hear them a mile off. but it's all personal taste. They do drone. I don't have tunes in my cars. (no, really.... nothing in my truck or my cars since the early 90s). The Dynomax Turbos will outflow a Flowmaster. Flows are not teh best for least restriction... but I don't like the DYnomax sound myself. They are a bit quieter. Get waht you like for sound. Hav it clamped in, if you dont liek it, change them. No biggie really.
