CTS vs MST B58 intake: the F30 340i comparison

This comparison is for the first-generation B58 in the US 2016–2018 F30 340i. CTS identifies its revised F-series intake as CTS-IT-340R; MST lists BW-B5801 for the 140i/240i/340i/440i application family. Neither product name gives permission to substitute a G20 M340i intake. Engine family and engine generation are both important.

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CTS describes a 3.5-inch aluminum intake tube, reusable filter and two sealed heat shields. MST specifies a 3.5-inch tube, heat shield and washable filter for BW-B5801. Its page explicitly excludes the F23 convertible, showing why a shared engine does not erase body-style restrictions. Check the current kit contents rather than borrowing specifications from an MST Gen 2 intake-and-inlet package. Ask each supplier whether the original inlet remains, what sensor hardware transfers and what replacement filter is required. A combined intake/inlet offer should not be compared with an intake-only price as if the contents were identical.

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An exposed aftermarket intake may appeal to an owner who wants more audible induction, but a video recording is a poor way to predict cabin sound. CTS advertises power gains and no reported check-engine light in its testing. Those are manufacturer claims, not a guarantee for every installation or calibration. We have no controlled same-car CTS-versus-MST test that supports awarding either kit a power advantage.

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Several owner reviews hosted on the CTS product page emphasize sound and straightforward installation; one describes a tight fit. This is a seller-hosted, self-selected sample, not independent long-term failure data. It supports asking about clearance and installation access, not concluding that all kits fit perfectly or that a recurring defect exists. Ask owners about their exact kit revision, turbo inlet and engine configuration before transferring their experience to your car.

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Prioritize confirmed fitment, replacement-filter availability, the instructions you can obtain before purchase and the support available in your market. Compare delivered price and required extras at the same time; promotional prices change. If your goal is simply sound and the original system works correctly, decide whether that experience is worth the complete cost. If your goal is performance, require evidence matching your hardware and calibration. Keeping the original intake is a valid outcome.

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