JB4 Tuner for CLA250 & GLA250 • +60-85whp 2.0T Power Upgrade (2014–2019)

Want more power from your CLA250 or GLA250 without losing daily drivability? The JB4 is the easiest and most effective plug-and-play tuner for the Mercedes 2.0T engine — delivering big gains safely while keeping the car fully reversible.

Real Gains on CLA250 & GLA250

• +60–85 wheel horsepower on 91–93 octane
• Stronger mid-range pull and quicker 0-60 times
• Sharpened throttle response with less lag
• E85 maps available for even more power

✓ True plug & play • Reversible • Made in USA • 5-Year Warranty

Compatible Models

Perfect for 2014–2019 CLA250 and GLA250 owners looking for reliable power, better throttle, and easy installation. Works with stock or modified 2.0T engines.