glasspacks are probably less restrictive then most conventional mufflers. All they are is just a spiral tube basically. At idle its quieter than open headers but is still very loud, big rumble.
When you rev it up in neutral, they sound like open headers, thats probably the best thing for cruise nights right there.
But in gear, taking off full throttle, or doing a long burnout at one constant rpm, it can be the most annoying thing you have ever heard. Very very loud inside the car, especially when it comes straight from the headers. at one constant rpm not changing, when the motor is working the sound can be compared to an Extremely loud fart noise... gives you a headache after a while. Well me anyways.
I have never heard 1 chamber flowmasters, i will look into that. But i say stick with conventional mufflers, and just run open headers when u want to be loud, or cutouts. Glasspacks can also get u in trouble in normal everyday driving, depending on where u live.
I think what makes the glasspacks annoying is that they separate the exhaust gasses into "putts", the airflow sound is much less smooth. It makes it noisy, but some people like it some people dont. I for one like it , but burnout will give ya headaches with them.
Hope this helps. Oh and one more thing, i hear that "purple hornies" are really good glasspacks, opposed to cherry bombs.. but im not sure.
goodluck.
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