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*Custom tuning will be required to turn off the rear O2 sensors. The system does not have fittings for the rear O2 sensors since the ECM will still throw a "service engine soon" light with the cats moved so much further back vs. the factory location.
*5.7L Hemi vehicles will require a connection pipe that will neck down to the factory 2.5" exhaust. The S-pipes that come in the kit are setup to connect to the 6.1/6.2/6.4L exhaust systems, so you will have to cut the end of the S-pipes off and slip the reducer over it. You can select these 5.7L-specific connection pipes in the drop-down menu.