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So as of right now I have about 1’ of piping on my 01 coupe. I’m trying to decide on which cherry bomb to get; roughly looking for just more popping with no added raspiness. My choices so far are a m-80 2.5 in and out, 87522cb 2.5” in and out, or a 87510 2.25” in and out. What’s going to be the main differences in these 3 sound wise? With the open header my car sounds like a pissed off tractor lol.

 
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The longer it is the more it will filter out certain frequencies. Why are you running an open header?

 
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If you're running open header on an otherwise stock engine, you're gonna lose so much bottom end torque.