The Dinan S63 Stage 2 Kit is a standout performance upgrade for BMW enthusiasts who want to extract serious power from their S63-powered vehicles while maintaining everyday drivability. This comprehensive package combines precision-engineered hardware with factory-matched software, delivering measurable gains without sacrificing reliability. In this article, we break down the costs, installation workflow, real-world performance benefits, and key considerations for anyone considering this upgrade for their M5, M6, X5M, or X6M.

Understanding the Dinan S63 Stage 2 Kit

The Dinan S63 Stage 2 Kit is specifically developed for the BMW S63 twin-turbo V8 engine found in the F10, F06, and F12/F13 M models, as well as the E70 X5M and E71 X6M. Dinan has a long-standing reputation for producing CARB-legal, warranty-friendly tuning solutions that prioritize longevity. The Stage 2 kit builds on Stage 1’s software tuning by adding upgraded hardware that allows the engine to breathe more freely and stay cooler under heavy load.

The kit includes four main components:

  • High-performance software tuning – Recalibrates boost pressure, fuel mapping, ignition timing, and throttle response. The tune is flashed directly to the ECU using Dinan’s proprietary programmer (sold separately or included in some packages). It preserves factory safety parameters and is fully reversible.
  • Upgraded intercooler – A larger, more efficient intercooler core reduces intake air temperatures (IAT) by up to 20%, preventing power loss during repeated hard runs. This is critical for the high-heat environment of a twin-turbo V8.
  • Enhanced air intake system – A low-restriction intake system with a high-flow, reusable filter and optimized intake piping reduces air turbulence and increases volumetric efficiency. The system is sealed to draw cooler air from the front grille rather than from the engine bay.
  • Performance exhaust components (optional but recommended) – While not always included in the base Stage 2 kit, many installers pair it with Dinan’s sport exhaust, downpipes, or mid-pipes. These components reduce backpressure and complement the software tune, yielding higher power figures.

Dinan is one of the few aftermarket tuners to offer a limited warranty that matches the remainder of the vehicle’s factory protection when installed by an authorized dealer. This is a major selling point for owners concerned about voiding their original BMW warranty.

Cost of the Dinan S63 Stage 2 Kit

The total investment for a Dinan S63 Stage 2 Kit varies depending on your vehicle model, chosen labor provider, and any supplementary components. Here’s a detailed cost breakdown:

Kit Price

  • Base hardware + software kit: $3,500 – $4,500 for most S63 applications. The exact price depends on whether the vehicle is an M5, M6, or X5M/X6M, as intercooler and intake designs differ slightly between chassis.
  • Optional Dinan ECU programmer (if not already owned): $300 – $500. Many shops include this in the kit price, but confirm beforehand.
  • Performance exhaust components (suggested with Stage 2): $1,200 – $2,500 depending on cat-back versus full turbo-back systems.

Installation Costs

  • Independent BMW specialist shop: $600 – $1,000. Labor rates range from $100 to $150 per hour, and the job typically takes 4–6 hours.
  • Dinan-authorized dealer: $800 – $1,200. Authorized dealers have experience with Dinan parts and can ensure warranty compliance, but their shop rates tend to be higher.
  • DIY installation: $0 labor, but requires mechanical skill, proper tools (ratchets, torque wrench, scanner for ECU flash), and about 5–6 hours.

Additional Costs to Factor In

  • Software flashing fee: Some shops charge a flat fee ($150–$250) for the ECU tune if you already own the hardware kit.
  • Coolant flush and replacement: Because the intercooler circuit will be opened, plan on ~$50–$100 for fresh coolant and labor to bleed the system.
  • Potential supporting mods: With Stage 2 power levels (around 650–700 bhp on 93 octane), Dinan recommends upgrading spark plugs to a colder heat range and possibly the low-pressure fuel pump for sustained high-rpm use. Add $150–$400 for these parts.

To get an accurate, up-to-date price for your specific model, check the Dinan official website or use a retailer like GetBMWParts for current pricing and bundle deals.

Installation Process for the Dinan S63 Stage 2 Kit

Installing a Dinan S63 Stage 2 kit is an involved procedure that should be undertaken only by someone comfortable working on high-performance turbocharged engines. Below is a detailed walkthrough of the steps involved, based on both professional shop workflows and DIY experience.

Preparation and Safety

Before starting, disconnect the negative battery terminal and allow the engine to cool completely (ideally overnight). Gather all tools: a socket set with extensions, Torx bits (T25, T30, T40), flathead screwdriver, trim removal tools, coolant drain pan, and a scan tool capable of reading OBD-II data. If you are using the Dinan ECU programmer, ensure it has the latest firmware installed and the vehicle’s battery is fully charged (a battery maintainer is recommended).

Step 1: Remove the Engine Cover and Stock Air Intake

The engine cover is held by four push-clips and comes off easily. Next, disconnect the mass air flow (MAF) sensors and unclip the intake ducts from the turbo inlets. Remove the plastic air boxes and filter housings. Store the factory parts carefully for possible reinstallation later.

Step 2: Remove the Stock Intercooler

The stock intercooler is mounted at the front of the engine bay, above the radiator. You will need to:

  • Drain the coolant from the intercooler circuit (your vehicle’s service manual will indicate the drain location; typically a petcock on the lower intercooler or radiator end tank).
  • Disconnect the coolant hoses and charge air pipes (plastic piping from the turbos to the intercooler).
  • Unbolt the mounting brackets (four to six bolts) and carefully lift the intercooler out. It is heavy, so have a helper or a support tool ready.

Step 3: Install the Upgraded Dinan Intercooler

Position the Dinan intercooler in place. It is thicker and wider than the stock unit, so check for clearance against the radiator fans and front bumper structure. Secure it with the provided brackets and torque the bolts to spec (usually 8–10 Nm). Reconnect the charge air pipes and coolant hoses. New hose clamps are included in the kit—ensure they are properly tightened.

Step 4: Install the Dinan Air Intake System

Mount the new intake housings where the stock air boxes were. They typically use existing mounting points. Fit the high-flow filters onto the MAF sensor housings, then attach the intake ducts from the turbos. Make sure all seals are tight to prevent unmetered air from entering the system. Reconnect the MAF sensors and secure the wiring harnesses with zip ties away from heat sources.

Step 5: Flash the ECU with Dinan Software

This is the most critical step. Using the Dinan programmer or a laptop with Dinan software, perform the ECU flash. Begin by reading the factory file (a backup will be saved automatically). The flash process takes 15–20 minutes; do not interrupt power or disconnect the OBD link during this time. After flashing, the programmer will confirm a successful write. Clear any fault codes that may appear.

Step 6: Final Checks and Refill

Refill the intercooler circuit with the recommended coolant (Dinan specifies a G48-type or BMW-approved coolant mixed 50/50 with distilled water). Bleed the system by running the engine with the coolant cap off and heater on full heat, adding coolant as needed until bubbles stop. Double-check all hose connections, intake clamps, and intercooler fasteners. Reconnect the battery, start the engine, and let it idle for several minutes while monitoring for leaks. Perform a short test drive to verify the tune and transmission adaptation (if automatic).

Time and Difficulty

A professional shop will complete this installation in 4–6 hours. A competent DIY mechanic should allocate a full day, especially if it is their first time working on the S63’s intercooler system. The job is rated intermediate to advanced due to the steps involving coolant handling, turbo piping, and ECU flashing.

Performance Boosts and Real-World Gains

Once the Dinan S63 Stage 2 kit is correctly installed, the performance improvements are immediately noticeable. Dyno testing and owner reports consistently show the following gains:

Horsepower and Torque

On pump gas (93 octane), the S63 engine in stock form typically produces 560–575 bhp at the crank. After Stage 2, output jumps to around 650–680 bhp and 600–620 lb-ft of torque, depending on the specific model and how well the additional exhaust components flow. That is an increase of roughly 90–120 horsepower and 90–110 lb-ft of torque over stock. On race fuel or ethanol mixes (E30–E50), some owners report peaks above 700 bhp, though Dinan’s tuning remains conservative to protect engine parts.

Throttle Response and Drivability

The software recalibration sharpens pedal feel, eliminating the factory’s slight lag at low RPM. The engine feels more responsive from 2,000 RPM, with the intercooler keeping intake air 15–20°F cooler according to logged data from forum members on Bimmerpost. This results in consistent power even during repeated pulls on hot days.

Top-End Pull and Speed

Beyond the initial burst, the Stage 2 kit maintains strong power all the way to the redline. The enhanced intercooler and intake allow the turbos to produce higher boost levels (typically peaking around 20–22 PSI vs. stock’s 16–18 PSI) without inducing knock. Quarter-mile times drop by 0.4–0.6 seconds, putting the F10 M5 in the high 11-second range at 119–121 mph.

Reliability and Maintenance Implications

Dinan tunes are known for their safety margins: they add boost while reducing fuel trims within an acceptable window. The Stage 2 kit does not require forged internals or upgraded turbos. However, owners should be prepared for more aggressive maintenance. Spark plugs should be changed every 30,000 miles (instead of the stock 45,000) to 60,000 miles, and the oil should be changed at 5,000-mile intervals using a quality 0W-40 or 5W-40 full synthetic. The upgraded intercooler may also require periodic cleaning of its fins to maintain thermal efficiency.

Additional Considerations When Going Stage 2

Fuel Requirements

To achieve the advertised gains, 93 octane (AKI) or higher is required. On 91 octane fuel, common in the western United States and parts of Europe, the ECU may pull timing and reduce boost, netting only 620–640 bhp. If you live in a 91 octane region, consider upgrading to the optional Dinan high-pressure fuel pump or adding a methanol injection kit (not included in the Stage 2 kit).

Dinan holds CARB EO numbers for many of its California-legal products. The Stage 2 kit is generally street-legal in all 50 states when installed with the provided software. However, if you pair it with aftermarket downpipes that remove catalytic converters, you may fail emissions testing. Dinan’s own exhaust components are designed to keep primary cats intact, so they remain compliant.

Insurance and Warranty

Because Dinan offers a matching limited warranty, you can notify your insurance company that the modification is manufacturer-backed, which may keep your premium from skyrocketing. Always check with your provider: underwriting rules vary, but having documentation of a professionally installed, warrantied kit helps.

Alternatives and Competition

While this article focuses on Dinan, the S63 engine is served by many tuners (ESS, VF Engineering, Evolve, Active Autowerke). Dinan’s main advantage is its warranty integration and conservative tuning. Competitors often yield higher peak numbers (700+ bhp) but may compromise emissions legality or engine safety margins. For daily-driven cars, Dinan remains a top choice for reliability-minded owners.

Conclusion

The Dinan S63 Stage 2 Kit is a well-balanced performance upgrade that delivers genuine horsepower and torque gains without resorting to extreme measures. The upfront cost—ranging from roughly $4,500 to $7,000 for the complete package with installation and exhaust—offsets with the peace of mind of a factory-matched warranty and proven durability. Whether you are tracking your M5 or simply wanting more passing power on the highway, this kit transforms the S63 into a formidable powerplant while keeping the car civilized enough for daily use.

For further reading, refer to Bimmerpost owner reviews, and verify your vehicle’s fitment on Dinan’s product page before purchasing. As with any performance upgrade, ensure you budget for supporting modifications and more frequent maintenance to fully enjoy the transformation.