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Check out all the options for the Flows, they make multiple mufflers (2 chamber, 3 chamber, etc...) that all have different pitch and volume levels. Glasspacks are for farm trucks, not mustangs.
I have the cherry bomb mufflers not glass packs on my 90 gt they where on it when I got it. Compared to my mac mufflers on my 85 and the flowmaster mufflers on my brothers 85 I like the cherry bomb sound better. It's not as loud as the other 2 but sounds tuff when you crack down on it. The ones i have are just the mufflers welded in a stock exhuast, not a complete cherry bomb exhaust. The to 85's are the complete exhaust one 2 1/4 and the other 2 1/2. So not sure how loud the cherry bomb exhaust system would be, or even if they make one.