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Kit for US-Spec M3 E46 headers.

The OEM US-Spec headers are fitted with pre-cats, which are a real bottleneck in performance.

This kit replaces them with high performance HJS units, in case you don't want to fit our full headers and front cats setup, extend the O2 sensor wires or tune the ECU.

It's necessary to cut the originals right after the 3 into 1 collectors and weld the Supersprint cats onto them.
O2 sensor bungs are included in the same position as stock.

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