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Yea, I'm looking to sell them. They do have a popping sound, but only when slowing down from a high RPM to low. And when I say high, I mean around 6000-6500 and letting it drop to about 4000. That's the only time I've had it happen. If you're interested in buying them send me a PM and I'm sure we can work something out.
I went with an O/R x pipe and SLP loudmouths and its ridiculously loud. I'm about to swap the SLP for Roush and see how that does. I would deffinitely have mufflers on it.
I have Kooks, OR Xpipe and Roush and it is crazy loud under acceleration.