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can confirm catless headers into stock NPP is unbeatable. No drone at all either, gas fumes POUR out in track mode but other than that little to no smell unless idling at light with windows down for a long time.
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22 m6 zl1. cammed, headers, etc
![https://ibb.co/qpWHXZM][img]https://i.ibb.co/NKm0Q46/zl1.jpg](image.php?u=142930&type=sigpic&dateline=1633060705)
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