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Make it easy, I just put loudmouths on then bought loudmouth 2 mufflers and switched out. I have BBK catted X. The 1's are way better. They do have some popping and are loud in car at 70. 2's still pop and is loud at 70. But when giving it gas from 1-3 it is quiet. The 1's just kick *** and sound like a F1.