The Marketplace for Performance Tunes
Buy and sell verified performance calibrations from professional tuners. Real dyno results, honest reviews, and tunes that deliver.
Verified Tuners
Every tuner goes through our verification process. Only professionals with proven track records sell here.
Dyno-Proven Results
Real horsepower and torque numbers backed by dyno charts. No inflated claims, just verified data.
Honest Reviews
Purchase-verified reviews from real owners. See exactly what to expect before you buy.
Featured Tunes
Top-rated calibrations from our verified tuners
B58 Stage 2 Performance
BMW 340i / M240i / 440i · 2016-2020
Aggressive Stage 2 tune for the B58 platform. Requires downpipe and upgraded intercooler.
EA888 Gen3 Stage 1
VW Golf GTI / Audi A3 / S3 · 2015-2022
Bolt-on friendly Stage 1 tune. No hardware modifications required. Smooth daily drivability.
Coyote 5.0 E85 Race
Ford Mustang GT S550 · 2018-2023
Full E85 race calibration for the 5.0L Coyote. Headers, intake, and E85 fuel system required.
Duramax L5P Economy+
Chevrolet Silverado 2500/3500 · 2017-2024
Economy-focused diesel tune. Improved MPG while adding moderate power for towing.
Top Tuners
Trusted professionals delivering consistent results
BimmerBoost Labs
EuroTune Dynamics
American Muscle Tunes
DieselWerks Tuning
Rising Sun Performance
Flat4 Tuning Co
Recent Reviews
What real owners are saying about their tunes
2019 BMW 340i xDrive
Absolutely transformed my 340i
Went from feeling like a fast sedan to a straight-up rocket ship. The power delivery is incredibly smooth and the anti-lag feature is addicting. Dyno showed 385whp on 93 octane. BimmerBoost Labs nailed it. Communication was great throughout the process and the revision turnaround was fast.
2020 BMW M240i
Best B58 tune on the market
I've tried three different tuners for my B58 and this is by far the best calibration. The power is there but it doesn't feel unsafe or unrefined. Daily drove it for 6 months with zero issues. Trans tune makes a huge difference on the ZF8.
2018 BMW 340i
Great tune, cold weather quirks
Power delivery is fantastic and the car feels alive. Only minor issue is some cold start roughness in sub-20°F temps. Tuner said they're working on a winter revision. Overall extremely happy with the purchase.
Ready to unleash your engine?
Join thousands of enthusiasts who trust Kaffee Werks for their performance calibrations.