Rk Tunes Promo Codes – Verified Deals & Offers | September 2026
Save on BMW S55 ECU Flash Tune, BMW S58 ECU Flash Tune with 41 manually verified Rk Tunes offers, updated for September 2026. Browse the latest Promo Codes, working discounts, and exclusive deals, with expired offers removed regularly.
Rk Tunes offers 5 coupon codes and 36 deals as of September 2026. Today's top offer: Shop MHD Wireless WiFi OBD2 Flash Adapter for BMW E F G Series At $78.99. Codes are verified and updated daily.
Grab 5% instant savings with this discount code on your sitewide purchases. Hurry Up!
Achieve peak engine performance with 35% off our advanced Port Injection Kits.
Secure a 40% discount on the LPFP Upgrade, ensuring your engine receives optimal fuel flow.
Shop the Spark'd A Cig Essential Tee from RK Tunes for $40.00.
Enhance your vehicle's performance with 30% off our high-quality Front Mount Intakes.
Unlock your engine's full potential with a massive 50% reduction on E85 Flex Fuel Kits.
Upgrade your BMW S55 with a 20% discount on our powerful ECU Flash Tune, delivering significant performance gains.
Boost your vehicle's performance with X3M Front Mount Intakes, now 25% less. Experience improved airflow and power for your drive.
Boost your B58's performance! Get 30% off our B58 intake manifold, engineered for optimal air delivery and horsepower.
Enhance your N55 engine with 20% reduced pricing on our premium intake systems. Improve throttle response and engine sound.
Unlock your M340i's potential! Enjoy 35% off our M340i intake, designed for maximum airflow and performance.
Unleash your B58's true power with 40% lower costs on our high-flow downpipes. Experience significant performance gains.
Maximize your S55 engine's efficiency! Save 28% on our S55 front mount intake, delivering superior airflow and power.
Upgrade your vehicle with X3M Front Mount Intakes, now available at 25% less. Enhance performance with this limited-time offer.
Boost your B58 engine's performance with a 35% discount on our premium intake manifolds. Enhance power and efficiency.
Get 20% off all N55 front mount intakes. Improve your engine's breathing and unleash more power today.
Experience a significant power upgrade with 30% lower costs on our G80 intake systems. Optimize your engine's performance.
Ensure peak engine health with 15% off all air intake filters. A clean filter means better performance and longevity.
Unleash the ultimate sound and performance with 50% off our premium titanium exhaust systems.
Upgrade your vehicle with 28% off B58 downpipe upgrades and a selection of performance intakes. Enhance your ride for less!
Upgrade your X3M with 32% less on our performance intake systems. Unlock more horsepower and torque.
Upgrade your BMW with premium X3M Front Mount Intakes and save 25% today. Experience improved performance and airflow.
Boost your N55's power with 35% savings on our premium intake kits, engineered for optimal efficiency.
Unlock your B58's potential with 20% off high-flow downpipes, improving exhaust gas flow and sound.
Experience superior sound and weight savings with 40% off our lightweight titanium exhaust systems.
Customer Reviews
Brings the power!
I got the BMW S63TU Tune and it transformed my car! The power increase is seriously impressive, it pulls so much harder now. Flashing it was pretty simple with the OBDII Flashing Cable I also got. My M5 feels like a completely different beast, in the best way possible. I'm telling everyone with an M car about Rk Tunes!
Always reliable, great tunes
This was my third time buying from Rk Tunes, this time for a BMW S58 ECU Flash Tune. Like my previous N55 and S55 tunes, the S58 flash was smooth and everything worked perfectly. I appreciate the consistency. My car feels strong, and the process was just as easy as before. I keep coming back because their tunes just work, no drama, and they always deliver the performance they promise.
Tune was easy to do
Grabbed a BMW N55 Performance Tune for my 335i. It was my first time flashing a car and it went pretty smooth. Instructions were clear enough. Car runs way better now, feels like it woke up. Happy with it.
Good B58 tune, slow support
I ordered the BMW B58 ECU Flash Tune a few weeks ago. The tune itself is solid and I definitely felt a good power bump on my car. Installation was straightforward with the provided instructions. However, I had a question about datalogging afterwards and it took about 3 days to get a response from customer service. While the tune is good value for the performance, they could improve their response time.
Rk Tunes Community Discussion
Share tips, ask questions & help fellow shoppers save more
Thinking of getting a B58 tune from RK, but I'm torn between them and Bootmod3. Anyone have experience with both?
What's the deal with flashing? Do I need some special cable or will any OBDII cable work for my M3?
Hey, does RK Tunes ever do sales? Specifically for Black Friday or around the holidays? Trying to budget for an S55 tune.
Thinking about the S63TU tune. How long does the remote tuning process usually take from start to finish?
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