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I have true dual Flowmaster 40s, no cats, and, its loud, and sounds good at idle, but...it has an obnoxious blapping sound at full throttle.
From what I've been told, having two single pipes (no x or h-pipe) and the pipe being too small can both cause that. Though, I have 2.5"...so, too small probably not.
So, in other words, no matter what you do, add a crossover for better sound...unless your 2 into 1 into 2...then you've already done that. And, the bigger the pipe, the deeper the tone. But, keep in mind, the bigger the pipe, the more low end you lose (you basically move the power band up more towards top end).
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