glass pack and and muscle car sound

I ran Flowtech Terminators in a full 2.5" system on my 383 Fury. They were very deep compared to any Flowmaster I have ever heard. It gave the car a nice but not too loud rumble at idle, no resonance or excessive loudness at cruising speeds, yet they were pretty damn loud when you stood on it. They are solid and heavy which is probably why they don't resonate like FM's and hold up so well.