Introduction: Unlocking the G87 M2’s True Potential

The BMW G87 M2 is already a formidable machine from the factory, blending a punchy S58 inline-six engine with sharp handling. However, for enthusiasts seeking even more power, sharper throttle response, and a more aggressive exhaust note, the Dinan Power Package stands out as a comprehensive, warranty-friendly upgrade. Dinan Engineering has long been a trusted name in BMW performance, and their package for the G87 M2 typically includes an ECU tune, a high-flow air intake system, and an upgraded downpipe. This guide provides an in-depth, step-by-step installation process that goes beyond the basic instructions, covering preparation, detailed procedures, torque specifications, and post-installation checks to ensure a safe and successful upgrade.

Understanding the Dinan Power Package

The Dinan Power Package is not a single part but a carefully engineered bundle designed to work together. It includes three main components:

  • Dinan ECU Tune – Reprograms the engine control unit to increase boost pressure, optimize fuel mapping, and adjust ignition timing. Dinan’s tuning is known for being conservative yet effective, maintaining safety margins and often preserving the factory warranty when installed by an authorized dealer or following proper procedures.
  • Dinan High-Flow Air Intake System – Replaces the restrictive factory airbox with a larger, less restrictive system that includes a high-flow filter and heat shield. This reduces intake air temperature and improves airflow into the turbos.
  • Dinan Downpipe – A less restrictive downpipe (often catted or catless options) that reduces exhaust backpressure, allowing the turbochargers to spool faster and increasing overall power output. The downpipe also contributes to a deeper, sportier exhaust note.

Expected Performance Gains and Benefits

While exact numbers can vary by vehicle and fuel quality, Dinan typically quotes gains of approximately 40–60 wheel horsepower and 50–70 lb-ft of torque with the full Power Package. The real-world benefits include:

  • Increased mid-range passing power
  • Sharper throttle response from the reflashed ECU
  • A more aggressive exhaust note without being overly loud
  • Improved turbo spool from the downpipe and intake

Dinan’s tune also often features a top-speed limiter removal (where legal) and enhanced cooling targets to keep the engine happy during sustained driving. For more detailed dyno charts and verification, visit the official Dinan G87 M2 product page.

Tools, Equipment, and Preparation

A successful installation requires the right tools and a safe workspace. Beyond the basic list in the original guide, here is a more comprehensive checklist:

Required Tools

  • Socket set with metric sizes (10mm, 13mm, 15mm, 18mm)
  • Torque wrench (range 10–150 Nm / 7–110 lb-ft)
  • Flathead and Phillips screwdrivers
  • Trim removal tools (for plastic clips)
  • Oxygen sensor socket (22mm) for downpipe
  • Jack stands and floor jack or vehicle lift
  • Safety glasses and mechanic gloves
  • Brake cleaner or degreaser for cleaning surfaces
  • Shop rags and a fire extinguisher (recommended)

Workspace and Vehicle Preparation

Work in a well-ventilated, clean area. Ensure the G87 M2 is on level ground and the engine is completely cool (typically wait at least 2 hours after driving). Disconnecting the battery is critical – start by removing the negative terminal (10mm nut) and isolating the cable to prevent accidental contact. This avoids any electrical shorts or sensor damage during the installation.

Detailed Step-by-Step Installation

1. Disconnect the Battery (Negative Terminal)

Using a 10mm wrench or socket, loosen the nut on the negative terminal clamp. Remove the cable from the battery post and tuck it away safely. Wait at least 5 minutes for the vehicle’s electrical systems to fully discharge before proceeding.

2. Remove the Engine Cover and Sound Insulation

The S58 engine cover is secured by a few bolts (usually 10mm or 8mm) and some press-fit clips. Carefully remove them and lift the cover off. You may also need to remove the insulation pad underneath if it obstructs access to the intake or downpipe. Set all hardware aside in a labeled container.

3. Install the Dinan ECU Tune (First Steps)

The Dinan tuner (typically a handheld device) connects to the OBD-II port located under the dashboard on the driver’s side. Plug it in and follow the on-screen instructions. It will first read and backup your factory ECU file. This is a critical step – do not interrupt the process. Once the backup is saved, the device downloads the Dinan tune and flashes it into the ECU. This can take 5–10 minutes. After the flash is complete, disconnect the tuner. Do not start the engine yet; more components will be changed.

Note: If your vehicle is equipped with a software lock (e.g., BMW’s latest DME security), you may need to follow additional procedures. Dinan provides detailed instructions. Check their support site for updates: Dinan Support.

4. Replace the Factory Air Intake System

Begin by removing the engine cover if not already done. Locate the factory air intake duct and airbox assembly. Use a flathead screwdriver to loosen the clamps securing the intake hose to the turbo inlet. Disconnect any electrical connectors (e.g., MAF sensor) by pressing the release tab and pulling gently. Remove the entire factory intake – this may require lifting the car slightly to access lower bolts. Clean any debris from the intake tract.

Now install the Dinan intake system. Start by attaching the heat shield using provided hardware (torque to 8 Nm / 6 lb-ft). Slide the intake filter onto the inlet pipe and ensure it is seated correctly. Connect the intake tube to the turbo inlet, tightening the clamp to 5 Nm (4 lb-ft). Reconnect the MAF sensor and any vacuum lines. Double-check all connections for leaks.

5. Install the Dinan Downpipe

This is the most involved step. You will need to access the underside of the vehicle. Safely lift the car using jack stands or a lift. The factory downpipe is located beneath the engine, connected to the turbocharger outlet and the exhaust system.

  • Step 5a: Remove the heat shields around the downpipe (usually 10mm bolts).
  • Step 5b: Disconnect the oxygen sensors using an O2 sensor socket. Label them to avoid mix-up (front and rear sensors have different part numbers).
  • Step 5c: Unbolt the downpipe from the turbo via two nuts (15mm or 18mm, torque around 45 Nm / 33 lb-ft when reinstalling).
  • Step 5d: Unbolt the downpipe from the exhaust system (V-band clamp or flange, typically 13mm bolts).
  • Step 5e: Remove the old downpipe. It may take some wiggling to clear the subframe.
  • Step 5f: Install the new Dinan downpipe. Use new gaskets on both turbo and exhaust connections. Tighten turbo nuts to 45 Nm (33 lb-ft) and exhaust flange bolts to 25 Nm (18 lb-ft). Reinstall oxygen sensors and torque to 40 Nm (30 lb-ft).
  • Step 5g: Reinstall all heat shields meticulously to prevent heat-related issues.

Important: A catless downpipe may trigger a check engine light due to reduced catalytic efficiency. Dinan’s tune typically includes software to eliminate this, but if you experience a CEL, it may need a secondary O2 spacer. Also, ensure the downpipe does not contact any body or suspension components – adjust if necessary.

6. Reconnect All Components

Double-check every connection: intake clamps, electrical connectors, vacuum lines, downpipe bolts, and heat shields. Reinstall the engine cover and any sound insulation. Finally, reconnect the battery negative terminal. Torque the battery nut to 6 Nm (5 lb-ft) – do not overtighten.

Post-Installation Procedures

7. Clear Fault Codes and Initial Startup

Reconnect the Dinan tuner to the OBD-II port. The device may automatically detect new install and offer to clear any fault codes. Alternatively, you can use a generic OBD-II scanner. Do not skip this step – residual codes from disconnected sensors during installation can cause odd behavior. After clearing, start the engine and let it idle for 5–10 minutes. Listen for any unusual noises, check for exhaust leaks, and monitor the dashboard for warning lights. The engine may run slightly rough initially as the ECU adapts.

8. Test Drive and Adaptation

Take the car for a gentle test drive, avoiding full throttle for the first 20 miles. This allows the ECU to learn the new hardware characteristics. After that, gradually increase throttle application. You will notice improved throttle response, a more linear power delivery, and a deeper exhaust tone. Pay attention to any hesitation or boost spikes; if present, recheck intake and downpipe connections.

For a comprehensive overview of common installation issues and solutions, visit the enthusiast forum at Bimmerpost G87 M2 Forum where many users share their Dinan experiences.

Troubleshooting Common Issues

  • Check Engine Light (CEL) on startup: Most likely an oxygen sensor not properly connected or a downpipe that is too close to a sensor. Recheck sensor plugs and routing. If using a catted downpipe, a CEL is less common; catless may require a tune update.
  • Rough idle or hesitation: Could be a vacuum leak from the intake system or a loose clamp. Also, verify that the ECU flash completed fully. Reconnect the tuner and attempt a reflash if needed.
  • Whistling noise from intake: This can be normal with a high-flow intake, but a severe whistle indicates an air leak. Check filter and tube connections.
  • Battery drain or electrical glitches: If you did not properly isolate the battery terminal or shorted a circuit, a fuse may blow. Check fuses related to engine management.

Long-Term Maintenance and Considerations

The Dinan Power Package is designed for long-term reliability, but regular maintenance remains important. Clean or replace the air intake filter every 30,000 miles or as recommended by Dinan. The downpipe may accumulate soot, especially if catless, but it does not require service. If you ever need to return the car to stock, the tuning device allows you to reflash the factory file. Note that some installations require professional-level tools for rare issues – consult a Dinan Authorized Dealer if in doubt.

Conclusion: Enjoying the Upgrade

Installing the Dinan Power Package on your G87 M2 transforms its driving character while maintaining the civility and durability of a factory-tuned car. By following this detailed step-by-step guide, you have not only upgraded the hardware but also gained a deeper understanding of your vehicle’s systems. The result is a more responsive, powerful M2 that is still perfectly daily-drivable. Take pride in the work and enjoy the enhanced performance – every twist of the throttle will remind you why you chose Dinan.