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Actually, it's not the breathing as much as it was adding the muffler.
The first run was a baseline. The second was after the Chinese headers were added. The third was after the muffler was added to the Chinese headers.
My butt dyno felt the bump in torque and the parts were free, so I couldn't lose on this deal... except for the twin chamber muffler being so freakin' loud with cabin resonance.
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