BMW 3 / 4 Series (B58)

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The B58 is one of the most common turbo straight-sixes of the last decade, and the parts market for it is crowded. This page collects TITANVEIN downpipes, midpipes and rear sections for B58 cars in SS304 and titanium, with catted and catless downpipe options.

Most owners start with the downpipe. The 4 in and 5 in versions are intended for later turbo upgrades; for a stock turbo, the 3 in range is the better match. Rear sections come standard or valved, and a valved version noticeably changes the daily tone without any ECU change.

What to check before ordering

  • A larger downpipe is not automatically better: 4 in and 5 in serve high-power targets, while a stock turbo is better matched to 3 in.
  • Catalyst position and sensor layout vary by build year on the B58 — always confirm the chassis code.
  • A catless downpipe will normally trigger a check-engine light and needs ECU work.

FAQ

Does a B58 downpipe need a tune?

Catless versions usually do; catted versions often do not. Confirm with your tuner.

Does a valved rear section need extra wiring?

It needs a vacuum or electronic control source. The product page states what is included.

Start here

B58 cars take a different layout from the B48, so start from the engine code. This range covers the full system from downpipe back.