I bought a '79 Bronco a couple of months ago and it came with glasspacks (surprise, surprise). I've always hated the sound and I think it's embarassing to drive. When you buy cheap mufflers, that's what you get. Cheap mufflers. They are LOUD and do nothing but kackle and pop. To me glasspacks make a car/truck sound like the motor is running on half it's cylinders with straight pipes. It's just hideous IMO. Maybe I'm biased because I didn't grow up in the 60's or 70's, but I can't think of a worse sounding muffler. I'd rather run open headers. Once I buy some of the stuff I need for the Stangs I will be getting a new set of cheap headers for the Bronco and then taking it to an exhaust shop to get a decent sounding exhaust (with REAL mufflers) fabricated. Everybody has Flowmasters, but there's probably a reason for that. I think they sound great.