Racebox

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Racebox Performance Tuning Shop located in Houston, Texas. We specialize in the VR30, B58, S58 and more!

722whp & 621wtq A90 Supra! Who said you can’t have fun with a hybrid turbo? 🌽🔥This Pure800 Supra was dropped off to get ...
10/08/2026

722whp & 621wtq A90 Supra! Who said you can’t have fun with a hybrid turbo? 🌽🔥

This Pure800 Supra was dropped off to get set up for more power! After taking care of a few minor repairs, we added port injection to its existing intake manifold, an additional LPFP, and a Motiv Reflex+ to bring all the hardware together! Along with the fueling upgrades, we also installed an upgraded carbon driveshaft, upgraded rear axles, and BMR’s catch can + block off pins. 💪

After the installations, we strapped it to the dyno and dialed in three flexfuel maps! Hybrids are known to be pretty torquey/punchy, however the Pure800 gives us great control over torque delivery vs some other hybrids we’ve seen. That’s especially important for this Supra since it’s still on the stock transmission! 😮‍💨

Dyno results:
- Map 1 93: 444whp / 456wtq
- Map 2 93: 519whp / 488wtq
- Map 1 E70: 582whp / 552wtq
- Map 2 E70: 649whp / 593wtq
- Map 3 E70: 722whp / 621wtq

Tuned by Racebox ♾️ via MHD Tuning

Ready to get your Supra dialed in? We offer parts, installation, and custom tuning all under one roof! 🔧

📲 (832) 786-9038
📩 [email protected]

Full mod list:
- Pure Turbos Pure800 turbo
- AMS Performance intake manifold
- Injector Dynamics ID1050 port injectors
- Spool Performance LPFP upgrade
- Motiv Reflex+
- blackmarketrace catch can & block off pins
- The Driveshaft Shop carbon driveshaft
- Titan Motorsports upgraded rear axles
- AWE catback
- Catless downpipe
- MST Performance intake
- FTP chargepipe

G99 M5 Touring in for IRL Unleash The Beast catless downpipes and their full catback exhaust! 😮‍💨🔊The new M5 might be a ...
10/07/2026

G99 M5 Touring in for IRL Unleash The Beast catless downpipes and their full catback exhaust! 😮‍💨🔊

The new M5 might be a hybrid, but there’s still a 4.4L twin turbo V8 under the hood! With the IRL downpipes and catback installed, you can hear a whole lot more of it, and hearing it fire up after the install was easily our favorite part. 🔥

There’s something about a wagon sounding like this that makes it even better.

After deciding the 1000+whp G80 we built for him a while back was a little too fast for daily driving… He sold it and picked up this M5 wagon for more comfort and practicality with the family. However, keeping it quiet was never part of the plan! 😆

📲 (832) 786-9038
📩 [email protected]

576whp & 494wtq on 93 and stock clutch!🔥This matte grey manual M2 stopped by for more power, but we were held back by th...
10/06/2026

576whp & 494wtq on 93 and stock clutch!🔥

This matte grey manual M2 stopped by for more power, but we were held back by the stock clutch and Houston 93 fuel quality. The car only has a midpipe installed, and a “modified” CS flash with low torque meant for manual cars, but we think it runs like any other stock manual cars so we used it as our baseline. We kept the customer’s goals in mind when dialing in power and torque delivery, giving him two maps to choose from! 🤝

We dialed in map 1 at 505whp / 453wtq to help with traction in this RWD M2, and map 2 at 576whp / 494wtq for when the owner wants more power! Fuel quality ultimately limited map 2, but we still picked up 111whp & 88wtq over the baseline. 😮‍💨💪

Dyno results:
- Baseline (CS flash?): 465whp / 406wtq
- Map 1: 505whp/453wtq
- Map 2: 576whp/494wtq

Custom tuned by Racebox ♾️ via MHD Tuning

FREE DME unlock with the purchase of any custom tune! Contact us today to get started tuning your next build. 🤝

📲 (832) 786-9038
📩 [email protected]

738whp/684wtq from a manual G87 M2 on full E85 while retaining the stock clutch! 🔥✅This M2 stopped by for a fuel system ...
10/02/2026

738whp/684wtq from a manual G87 M2 on full E85 while retaining the stock clutch! 🔥✅

This M2 stopped by for a fuel system upgrade and our custom flexfuel tune! We installed 1050cc port injectors on the stock intake manifold, an upgraded drop-in LPFP, and a Motiv Reflex+ to enable true flexfuel tuning. 💪

On the dyno, we dialed in our usual two maps with different boost/fueling/timing targets, making 738whp & 684wtq on the highest setting with E85. That’s +254whp & +266wtq over stock! 😮‍💨 Past 520-530wtq it’s a little risky for the stock clutch, but the lower power map is set up with lower torque so the owner has options until he upgrades the clutch.

Dyno results:

- Stock: 484whp / 418wtq
- Map 1 93: 536whp / 461wtq
- Map 2 93: 584whp / 521wtq
- Map 1 E85: 678whp / 562wtq
- Map 2 E85: 738whp / 684wtq

Both maps automatically adjust to the ethanol content in the tank in real time, so the customer can run 93, E85, or any mix of both! Paired with on-the-fly mapswitch, there’s no need to reflash when changing fuels or maps! 🌽

Looking to get your S58 tuned? We offer parts, installation, and custom tuning all under one roof at Racebox! 🤝

📲 (832) 786-9038
📩 [email protected]

Tuned by Racebox ♾️ via MHD Tuning

Mod list:
- Precision Raceworks PI kit
- Injector Dynamics ID1050cc injectors
- PFS drop-in LPFP upgrade
- front mount intakes
- 🐱less downpipes
- MOTIV Motorsport Reflex+

678whp/567wtq Q60 on VRX70Bs & E50! 🔥🌽

Another day, another Z1 turbo upgrade at the shop! This time around, we installe...
09/30/2026

678whp/567wtq Q60 on VRX70Bs & E50! 🔥🌽

Another day, another Z1 turbo upgrade at the shop! This time around, we installed a set of VRX70B turbos, upgraded DI injectors, and full downpipes on this Q60. Just like most of our builds, we strapped it to the dyno right after!

With the upgraded injectors now paired with the car’s existing LPFP and HPFP upgrades, the fuel system had everything it needed to support the new turbo setup. From there, we dialed in multiple boost levels for both 93 and E50, working our way up to 678whp & 567wtq on the highest setting! 😮‍💨 Very impressive DI only numbers, especially considering this car is still equipped with the stock TMAP sensors (limiting boost) and only a single LPFP!

Dyno results:

- Low Boost 93: 403whp / 373wtq
- High Boost 93: 485whp / 481wtq
- Low Boost E50: 619whp / 556wtq
- High Boost E50: 678whp / 567wtq

Custom tuned by Racebox ♾️ via 💻

We don’t just tune 4000+ VR30’s… we build them too! Contact us today to get started:

📱 (832) 786-9038
📩 [email protected]

Mod list:
- 𝗭𝟭 𝗠𝗼𝘁𝗼𝗿𝘀𝗽𝗼𝗿𝘁𝘀 VRX70B turbos
- Spool Performance upgraded DI injectors
- Spool Performance FDPs
- Upgraded heat exchanger
- HKS®︎ catback exhaust
- HKS®︎ BOV
- Flexfuel kit
- AMS single LPFP
- AMS stage 3 HPFP

09/30/2026

.tuning making it look easy! Custom launch control feature for B58TU and S58!

Just foot brake to build boost, hold it for as long as you want, and go! We tested it real quick today on our G80 M3, not ideal conditions with the rain coming in and street tires at 37psi all around, but got boost low enough to dead hook even in our parking lot. 😂

Will this make you launch harder or run faster than before? Not necessarily, but it will make drag racing much more consistent, and can be dialed in for the street on not ideal surfaces. For cars with fast spooling turbos, high stall converters, etc., this will be even better. We’ll roll out these new features this week for guys currently tuning if applicable, and eventually update everyone else tuned by us that needs them.

📧: [email protected]
📱: 832-786-9038

1200whp Supra build is getting real… 👀 New YouTube video is LIVE!This time around, we finally pulled the stock engine an...
09/25/2026

1200whp Supra build is getting real… 👀 New YouTube video is LIVE!

This time around, we finally pulled the stock engine and swapped in a built one from O2uned, which should give us the foundation to push this car towards our goals. 🤝

Our mission with this shop-build series is to show YOU what it really takes to run a 7 second 1/4 mile, and there are still a lot more to come.

Next up, we’ve got a Ford 8.8 diff swap using the kit from Seems Legit Garage, LLC, a completely new fuel system from Spool Performance, some changes to the turbo, and a few other modifications we’ll be showing along the way.

Once everything is put together and working properly, it’ll finally be time to throw Alex’s Supra back on the dyno, break in the new engine, and then start turning things up. 😈

Full Episode 3 is live now on our YouTube! Link in bio 🎥

We don’t just build X58s… we tune them too! Contact us today to get started on your project! Parts, installation, and tuning all under one roof🫡

📲(832)786-9038
📥 [email protected]

09/23/2026

Our boy shah stopped by the shop today to turn up the volume on his M3 😮‍💨🔊

This G80 already had a resonated 🐱-less downpipe from IRL Unleash The Beast and a Valvetronic Designs Exhaust Systems catback exhaust from a previous visit, so today we added their HFD midpipe to complete the setup!

With the new midpipe installed, we grabbed a few sound clips and took it out for some POV pulls so you can hear the full setup in action. 👀 You might even hear it chirping the tires between shifts thanks to our custom 93 tune 😉

From parts and installation to custom tuning, we’ve got your G8X covered at Racebox! 💪

📲 (832) 786-9038
📩 [email protected]

485whp & 580wtq Supra on E50! 🌽🔥We previously tuned this Supra on 93 octane, and after having a few additional bolt-ons ...
09/22/2026

485whp & 580wtq Supra on E50! 🌽🔥

We previously tuned this Supra on 93 octane, and after having a few additional bolt-ons installed, the customer brought it back to us for a proper flexfuel tune!

However, during the very first pull, we noticed the car was no longer making the boost it used to... So before going any further, we grabbed our tools and started diagnosing it right there on the dyno. A smoke test quickly exposed a boost leak at the chargepipe coupler due to the way the clamp had been installed and tightened elsewhere. Rather than letting the issue end the dyno session, we got everything corrected right there and jumped straight back into tuning — allowing us to diagnose, fix, and fully dial in the Supra all in the same day. 💪

Dyno results:
- Stock: 382whp / 389wtq
- 93: 416whp / 474wtq
- Low Boost E50: 451whp / 493wtq
- High Boost E50: 485whp / 580wtq

We don’t always show this side of the job, but situations like this happen more often than you’d think. Not every car shows up ready for a perfect dyno session, and sometimes our job goes beyond just making changes to a calibration.

That’s why we pride ourselves on being more than just tuners. With parts, installation, diagnostics, repairs, and custom tuning all handled in-house, we’re equipped to take care of whatever the car needs and keep our customers moving.

At the end of the day, our goal is simple: get the car right and make sure the customer leaves happy. 🫡♾️

Full mod list:
- T51R mod (stock turbo)
- MST Performance intake
- FTP Chargepipe
- Spool Performance DP
- Flexfuel kit
- Single exit CBE
Custom tuned by Racebox ♾️ via MHD Tuning

Ready to take your Supra to the next level? Look no further, we offer everything you need under one roof 🫡

📲 (832) 786-9038
📩 [email protected]

Address

Houston, TX

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 5pm
Thursday 9am - 6pm
Friday 9am - 6pm
Saturday 12pm - 3pm

Telephone

+18327869038

Website

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