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Active Autowerke Signature downpipe for BMW B58 (G20 G22 F30 F32)
ACTIVE AUTOWERKE

Active Autowerke Signature Downpipe — B58

$1,805.00

Active Autowerke catted downpipe for the B58 — a big-bore, street-legal-equipment Stage 2 gateway. Opens the gating restriction while keeping a high-flow cat in the pipe.

Construction

Generously sized: 4.5" stainless tapering to 3.5" through a stainless flex joint, then to 80mm to meet the OEM system — never below the factory 80mm. 4.5" GESI G-Sport Ultra High Output cat (EPA-registered, 49-state / OBD2, no CEL; not CARB). Ships with the turbo flange gasket.

Where it fits in the build

Downpipe-side core of a B58 Stage 2 build; we calibrate around it. The Stage 2 Kit — B58 bundles parts + tune for 8% under à la carte.

Fitment

BMW B58 (single-turbo, 2024 & earlier) — M240i (F22/G42), 340i / M340i (F30/G20), 440i / M440i (F32/G22), Z4 M40i (G29). Confirm your chassis in the selector.

Fits engine B58
Fits chassis F22 · F30 · F32 · G20 · G22 · G29
Category Exhaust
Manufacturer Active Autowerke
What this is

A Part Recalibration is one focused revision built around the part you just bought. We take logs on your car as it runs now, on your current tune, then make a single full revision so this specific part delivers what it should. Hardware only does its job with a calibration shaped around it.

We bundle that tuning with the part right here, whatever brand the hardware is. If you want a fresh start across all your hardware, a Full Tune is the step up: a new base map, three revisions, and a written report.

This is a bootmod3 calibration. We tune through your own active BM3 license, so you'll need bootmod3 active on your car to load it.

Ships freight from Boca Raton, FL — additional fees may apply at checkout.

Step up to a Full Tune?

You've added a Part Recalibration to more than one part. At that point a complete tune does more for you: a Full Tune lays down a fresh base map and three revisions so all of your new hardware is dialed in together, with a written report at the end. We can roll your recalibrations into one Full Tune for $395 — below our standalone Full Tune, which starts at $495 for a four-cylinder and $595 for a six.

The Full Tune is a bootmod3 calibration — it loads through your active BM3 license, the same one you confirmed for the recalibration.
WHY WE SHIP ACTIVE AUTOWERKE
Active Autowerke has been building hardware for BMW for a long time, and that history shows in supercharger systems and exhausts that are engineered to a specific chassis rather than adapted to it. We carry their hardware because the depth of platform knowledge behind it tends to mean the kit fits and the supporting components are accounted for. On the naturally-aspirated platforms where a supercharger is the clean route to a real power increase, this is established, proven hardware. We reach for it when a customer wants a forced-induction path with a long track record behind it.