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Nashville BMW Repair

402 reviews
Text 'KENNEDY' to (615) 880-8003 to receive special offers!

From Our Customers

Finally, I found an awesome BMW shop! Everyone is super nice and Eugene who helped me out was very friendly and knowledgeable about BMWs, From performance to maintenance, they do it all! The best thing is I finally trust a shop to work on my BMW M2 and that's been hard to come by.
Joseph Shoemaker
5
The shop has helped me out several times. Their team knows the cars well and have come through for me consistently. They've even voluntarily helped me off the clock and has to be because they love the cars, right? The one time I didn't listen to their advice on something, it bit me. They know their stuff.
Ben Hoback
5
Patrick and the team were fantastic to work with. Quick, thorough evaluation of my cat and speedy, reasonably priced repairs. I had a couple of seals going bad and the estimate was accompanied by a series of high quality pictures to help me understand the situation. Top shelf all the way.
John Hoagland
5
If you are look for a place that gives you the best service for any of your BMW performance needs you have got to check out Kennedy performance in Nashville Tn. The best customer service and knowledge.
anthony lee
5
View all Reviews

Welcome to Kennedy Performance Center

We have a Top Notch Facility with 7 lifts, a Dyno and Great Technicians Ready To Keep your BMW in Top Notch Shape

At Kennedy Performance Center we are passionate about BMWs. At our facility we keep many BMW aftermarket parts in stock ready to be installed on your BMW. Our staff is very knowledgeable about everything from intakes to upgrading turbos so let us know how we can help make your BMW the way you have always dreamed.

We are also a full scale BMW repair facility that can handle anything the Dealerships or high priced shops can. Need a second opinion on work or quote, come see us , you will be happy you did!!

Learn more
  • Financing Options Available
  • Comfortable Waiting Room with TV and Refreshments
  • Free Wifi
  • Secure After-Hours Key Drop & Pick Up
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Warranty

FAQ

What modifications do you do to BMWs?

We perform a complete range of hardware upgrades, software calibration, and flex-fuel conversions for BMW N54, N55, B46, B48, S55, B58, and S58 engine platforms. Our services scale your vehicle safely from entrylevel bolt-ons to high-horsepower setups using MHD, bootmod3 (BM3), and EcuTek.

Modification Category

Supported Hardware & Upgrades

Tuning & Software Integration

  • Software & Flashing
    • In-House Bench & FEMTO Unlocking
    • Custom Remote Calibrations
    • Transmission Flashing (xHP)

    MHD, bootmod3, and EcuTek platforms configured for optimal boost, timing, and safety limits.

  • Flex-Fuel & Fueling
    • Plug-and-play Flex-Fuel Sensors
    • Upgraded HPFPs / LPFPs
    • Port Injection Kits & Controllers

    True flex-fuel scaling allowing seamless adaptation from 91/93 pump gas to full E85 ethanol.

  • Bolt-On Performance
    • High-Flow / Catless Downpipes
    • Upgraded Charge Pipes & Inlets
    • Performance Intake Systems

    Essential hardware modifications required to safely manage increased Stage 2+ boost pressures.

  • Engine Health & Safety
    • Crank Hub Fixes (S55/N54 mandatory)
    • Upgraded High-Performance Clutches
    • Heavy-Duty Axles & Drivetrain ComponentsStructural support and heavy-duty hardware built to handle high torque and high-tier power demands.

Turbocharger Upgrades & Systems

We engineer and tune custom turbo setups to match your specific power goals:

  • Hybrid Twin Turbos: Direct drop-in internal upgrades that retain factory routing, engineered for rapid spool and massive mid-range response (ideal for S55, S58, and N54).
  • Top-Mount Single Turbos: Maximum power configurations placing the turbo high in the engine bay for aggressive aesthetics, simplified service access, and unmatched peak horsepower capabilities.
  • Bottom-Mount Single Turbos: Stealth single-turbo systems designed to keep the engine bay looking factory-clean while providing high-volume airflow and top-tier top-end performance.

In-House ECU Unlock Services

Skip the shipping delay. We provide in-house bench and FEMTO unlock services on-site, allowing us to clear factory tuning locks and flash your custom MHD, bootmod3, or EcuTek software configurations the same day.

Ready to upgrade your vehicle? Contact us today to book your in-house unlock appointment, buy hardware, or schedule an optimization session!

Do you offer an in-house BMW ECU unlock service?

Yes, we provide in-house bench and auto-tuner ECU unlock services, plus FEMTO unlocking options, on-site for BMW B46, B48, S55, B58, S58, N63, and S63 engine platforms. Our local unlock services bypass the need for shipping delays, allowing you to instantly clear factory tuning protections and flash your custom software calibrations.

Unlock Service Type

Supported Model Years & Vehicles

Platform Compatibility

Turnaround & Delivery

  • In-House Bench Unlock
    • Most pre-June 2020 Bosch DMEs (F & Early G-Chassis)
    • Prepares ECU for MHD, bootmod3, and EcuTek flashes.
    • Takes about 1 hour to perform on-site.
  • Auto-Tuner & FEMTO Unlock
    • Post-June 2020 Bosch DMEs (Late G-Chassis M2, M3, M4, M5, M8, X5M, Supra)
    • Enables complete access for custom maps and flex-fuel scaling.
    • Fast in-house processing built to minimize vehicle downtime.

Why Choose Our In-House Unlock?

  • Fast 1-Hour Turnaround: Most in-house bench unlocks take approximately one hour to perform, letting you wait comfortably while we work.
  • Zero Shipping Delays: Eliminate the risk and downtime of mailing your vehicle's engine control module out to external vendors.
  • Instant Software Readiness: Once unlocked on-site, your vehicle is completely ready for custom calibrations, map switching, and advanced diagnostic logging.
  • End-to-End Tuning Support: We handle the full process—from performing the physical hardware unlock to setting up your final MHD, bootmod3, or EcuTek engine maps.

Ready to bypass factory restrictions? Book your in-house ECU unlock today to clear your tuning lock and flash your software the same day!

What tuning options do you have for BMWs?

We provide comprehensive engine calibration and flex-fuel conversions for BMW N54, N55, B46, B48, S55, B58, S58, N63, and S63 engine platforms using MHD, bootmod3 (BM3), and EcuTek software suites. As a premier full-service BMW tuning and repair facility and the area's only non-commissioned technician shop, our services scale your vehicle safely from entry-level flashes to high-horsepower custom builds with pricing well below dealer rates on most items.

Supported Engine Platforms Available Tuning Options & Stages Fueling & Software Specializations

  • N54, N55, B46, B48, S55, B58, S58, N63, S63
  • Stage 1: ECU Flash Only
  • Stage 2: Downpipes & Bolt-ons
  • Stage 3+: Upgraded Turbos & Custom Calibrations
  • MHD / MHD+ Suite: True automatic flex-fuel scaling, integrated anti-lag, and advanced transbrake capabilities.
  • bootmod3 CustomROM: Steering wheel map switching & rolling anti-lag.
  • EcuTek RaceROM: Precision port injection control.
  • Motive Reflex Integration: Utilized in all custom and flex-fuel tuning for flawless port injection control and advanced data mapping.

Flex-Fuel & Custom Calibration Capabilities

Our custom software calibrations allow for true flex-fuel scaling, enabling your vehicle to automatically map ignition timing, fuel volume, and boost targets anywhere from 91/93 pump gas up to full E85 ethanol, without manually changing maps. By utilizing Motive Reflex integration across all our custom and flex-fuel calibrations, we ensure seamless auxiliary fuel control and unparalleled engine safety.

Same-Day In-House ECU Unlock & Tuning

We back our tuning options with in-house bench and auto-tuner ECU unlock services, plus FEMTO unlocking options, on-site. Most in-house bench unlocks take about an hour to perform, completely eliminating mail-in shipping delays. Our in-house unlock service immediately makes the ECU ready for tuning, which we can perform at the exact same time as the unlock for a seamless, single-visit power upgrade.

Ready to experience our top-notch customer service? Contact us today to book your 1-hour in-house unlock and tuning session, buy performance hardware, or schedule your repair appointment!

Do you do dealer-level repairs?

Yes, we provide complete dealer-level repairs and advanced factory diagnostics as a premier full-service BMW tuning and repair facility. Because we are the area's only non-commissioned technician shop, you receive master-level mechanical expertise and 100% honest diagnostics with pricing well below dealer rates on most items.

Repair Category

Dealership Capabilities Offered

Our Honest, Non-Commissioned Advantage

  • Advanced Diagnostics
    • Factory ISTA diagnostics and module programming.
    • Electrical troubleshooting and wiring fault isolation.
    • Complex warning light and check engine light diagnosis.

    Identical dealership-grade equipment without the inflated flat-rate diagnosis fees.

  • Engine & Drivetrain Repair
    • Oil leak repairs (gaskets, valve covers, oil pan).
    • Cooling system overhauls (water pumps, radiators).
    • S55/N54 crank hub fixes and major mechanical repairs.

    Master technicians incentivized by the quality of the fix, never by commission on parts.

  • Routine Maintenance
    • Factory-scheduled oil, fluid, and filter changes.
    • Dealership-spec brake pad and rotor replacements.
    • Performance spark plug and ignition coil gapping.

    Precise, documentation-backed service that keeps your factory warranty completely intact.

  • Performance Integration
    • Fuel system upgrades (HPFPs, port injection kits).
    • In-house bench, auto-tuner & FEMTO ECU unlocking.
    • Full custom MHD, bootmod3, and EcuTek flex-fuel calibrations.

    Seamless mechanical repair and tuning under one roof—a service dealers cannot match.

The Non-Commissioned Difference

Traditional dealerships pay their service advisors and technicians on commission, which often leads to highpressure environments and unnecessary upsell recommendations. As a strict non-commissioned technician shop, our team focuses solely on the health and performance of your vehicle. We provide transparent estimates, prioritize safety-critical items, and never artificially inflate your repair bill.

Skip the dealership hassle and the dealership tax. Contact us today to book your dealer-level repair, routine maintenance service, or specialized diagnostic appointment!

What are customers saying about us?

Our customers consistently highlight our top-notch customer service, technical expertise, and fast turnaround times. As the area's only non-commissioned technician shop and a full-service BMW tuning and repair facility with a perfect 5-star rating across over 400 reviews, here is what our clients value most about our maintenance, performance upgrades, and in-house tuning services:

Service Experience

Key Customer Feedback & Takeaways

Community Reputation

  • Customer Support
    • Top-notch customer service with clear, transparent advice.
    • Thorough post-tune support and data-driven logging guidance.
    • Professional, highly communicative, and responsive technicians.

    5/5 Stars for client communication and building lasting trust.

  • Honest & Non-Commissioned
    • The only non-commissioned technician shop, ensuring zero high-pressure upsells.
    • Technicians are incentivized strictly by quality of work, not parts sold.
    • Completely transparent recommendations tailored strictly to your build goals.

    Highly praised for integrity, honesty, and pressure-free advice.

  • Tuning & Repair Facility
    • Comprehensive mechanical upkeep from routine care to deep engine repairs.
    • Dealership-grade diagnostics, factory component replacements, and troubleshooting.
    • Complete peace of mind knowing the same team handles both master-level repair and high-power tuning.

    Highly trusted as a true one-stop specialty shop.

  • Pricing & Value
    • Pricing well below dealer rates on most items for identical high-tier diagnostics.
    • Substantial cost savings on modules, unlocks, and complex coding.
    • Transparent estimates with zero hidden shop fees or dealership markups.

    5/5 Stars for extreme costeffectiveness and transparency.

  • Custom Flex-Fuel Tuning
    • Flawless dynamic scaling between pump gas and E85.
    • OEM-level driveability with massive power gains.
    • Reliable protection limits integrated by expert tuners.

    Highly recommended for daily-driven street and track cars.

  • In-House ECU Unlocking
    • Fast, hassle-free 1-hour turnaround times.
    • Complete elimination of risky ECU mail-in delays.
    • Immediate software readiness for same-day flashing.

    Recognized for immense convenience and zero vehicle downtime.

Common Praise from Drivers

  • Proven 5-Star Track Record: Backed by over 400 verified five-star reviews, we are recognized as one of the premier destinations for high-performance BMW calibrations.
  • Top-Notch Customer Service: Our team prioritizes the vehicle owner's experience. We answer technical questions thoroughly and guide you through every step of your build safely.
  • Unmatched Honesty: Because we operate as the only non-commissioned technician shop, our customers know that every diagnostic and component recommendation is 100% honest, with absolutely zero artificial sales pressure.
  • Complete Specialty Care: Beyond performance modifications, our clients value that we operate as a fullservice BMW tuning and repair facility, meaning your car receives master-level mechanical care alongside your software upgrades.
  • Dealer-Alternative Pricing: Enthusiasts appreciate getting premium, specialized engineering care at a cost that sits well below standard dealership pricing on most items.
  • Unmatched Convenience: Being able to wait comfortably for a single hour while an ECU is completely bench-unlocked is routinely cited as a game-changer.

Want to experience the difference yourself? Read our full customer reviews or Contact us today to book your performance session!

218 Space Park South Drive Nashville, TN, 37211 (615) 864-7110
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