BMW S63 sport catalysts: freeing up the twin-turbo V8 (M5, M8, X5 M, X6 M)

The S63 is a monster — a twin-turbo 4.4 V8 with huge tuning potential. Because it's a V8, the exhaust work is done per bank.

Why sport cats, not catless

On these late-model M-cars, 200-cell high-flow sport catalysts are the sweet spot: they retain emissions equipment and stay far more street-friendly than a catless setup, while still freeing up meaningful flow on a supporting tune.

Twin-bank set

Because the S63 is a V8, sport cats come as a matched set for both banks. It's a true bolt-on to the OEM mounting points, with the O2 sensor positions retained.

What fits

Fits the M5 (F90), M8 (F91/F92/F93), X5 M (F95) and X6 M (F96).

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