00–05 E46/Z3/E39/E83/E85 M54 MS43 CUSTOM N/A TUNE (S1/S2/S3)

BMW E46/E39/E83/E85 and Z3 with the M54 on MS43—custom naturally aspirated ECU tuning by Poverty Built. Stage 1 (OEM+), Stage 2 (headers & intake), and Stage 3 (advanced bolt‑ons/cams) deliver OEM‑smooth drivability, sharper throttle response, and conservative, data‑driven gains for street and track builds.

Fits:

• 2000–2006 E46 325i / 325xi / 325Ci — M54, MS43

• 2000–2004 E46/5 325ti — M54, MS43

• 2000–2006 E46 330i / 330xi / 330Ci — M54, MS43

• 2000–2004 E39 525i / 530i — M54, MS43

• 2003–2005 E60/E61 525i, 525xi / 530i — M54, MS43

• 2003–2006 E83 X3 2.5i / 3.0i — M54, MS43

• 2000–2006 E53 X5 3.0i — M54, MS43

• 2002–2005 E85 Z4 2.5i / 3.0i — M54, MS43

• 2000–2002 E36/7 Z3 2.5i / 3.0i — M54, MS43

• 2002–2005 E65/E66 730i / 730Li — M54, MS43

What Poverty Built does for this platform: Poverty Built focuses on smooth drivability and real, conservative gains. For MS43 + M54 (dual VANOS) we calibrate:

• Drive‑by‑wire throttle mapping for crisp but controllable response

• Fueling (lambda targets) and ignition timing across part‑ and full‑load

• Dual VANOS cam targets vs. RPM/load for intake & exhaust

• Air/load model and torque arbitration with DISA‑aware torque shaping

• Idle control, fan temperatures, rev limiter, and optional Vmax (top‑speed limiter)

• MAF/injector characterization when hardware changes warrant it

• Diagnostics alignment so plausibility checks match your hardware

STAGES, GAINS & PRICING

(Gains depend on health, fuel, altitude, hardware; we quote conservative deltas.)

STAGE 1 — OEM+ Performance (Stock Hardware)

• Gains: ~+10–15 hp / +10–15 lb‑ft (crank)

• Price: $180

• Hardware: 100% stock is fine; healthy sensors; no vacuum leaks; fresh filters/plugs.

• What we change: Throttle mapping, fueling/timing, dual‑VANOS targets, air/load model touch‑ups, rev limiter & Vmax (optional), fan/idle refinement. EWS alignment/delete on request.

• Use: Street. Emissions systems remain active.

STAGE 2 — Headers & Intake Optimized

• Gains: ~+15–25 hp / +15–25 lb‑ft (with intake and headers/free‑flow exhaust)

• Price: $220

• Hardware: Intake and exhaust upgrades; catless headers for off‑road use or high‑flow catted headers; tight vacuum/charge system.

• What we change: All S1 items plus airflow model updates for headers/intake, optimized dual‑VANOS & throttle maps for top‑end, and WOT fueling/timing tailored to your hardware. Rear O2/SAP handling for off‑road only.

• Use: Street (with emissions present) or off‑road when components are removed.

STAGE 3 — Advanced Bolt‑Ons / Cams (Custom)

• Gains: Hardware‑dependent; commonly up to ~+30 hp / +22 lb‑ft with cams, headers, free‑flow exhaust, and intake upgrades

• Price: $280

• Hardware: Performance headers*, freer exhaust; mild cams optional; strong cooling/maintenance.

• What we change: Full custom high‑load fueling/timing, dual‑VANOS advance/retard per cam profile, DISA/manifold‑specific torque modeling, idle stabilization for aggressive hardware, rev limit/Vmax, and diagnostics aligned to modifications.

• Use: Street (with emissions present) or off‑road when components are removed.

* Observe local laws when changing catalytic converters or installing headers.

WHAT YOU GET

• OEM manners, quicker response, stronger midrange without surging

• VANOS‑aware tuning for a broad, usable torque curve

• Revisions until it’s dialed (we’ll specify the minimal data to capture)

RECOMMENDED SUPPORTING MODS

• Stage 1: Fresh filters/plugs, tight vacuum system, healthy O2s/MAF, quality fuel

• Stage 2: Intake and freer exhaust, catless headers (off‑road) or high‑flow catted headers, strong cooling

• Stage 3: Headers + high‑flow exhaust, optional mild cams, upgraded cooling; wideband recommended for data

HOW ORDERING WORKS

1. Choose S1 / S2 / S3 and list your hardware in order notes.

2. Provide your MS43 read.

3. Flash with your preferred tool (simple step‑through available).

4. Send logs → we iterate to finalize.

LEGAL & OFF‑ROAD USE

Any calibration that affects emissions equipment (e.g., secondary air injection, catalytic monitor readiness, rear O2 reporting) is for closed‑course competition/off‑road use only. You are responsible for knowing and following local laws.

POVERTY BUILT DISCLAIMER

By purchasing this product, you agree that Poverty Built LLC is not liable for any damages including, but not limited to: engine failure, drivetrain damage, emissions violations, incomplete tuning results, or any indirect, incidental, or consequential damages arising from tuning services. All tuning is intended for off-road or motorsport use only and is not certified for use on public highways or as a method of emissions defeat. You also agree to our posted refund policy, and acknowledge that tuning results may vary depending on vehicle condition, modifications, and installation quality. It is your responsibility to ensure your vehicle is mechanically sound and properly maintained before and after any tuning service.