Thinking about a JB4 for your Q50 2.0T? Read this first.

The one thing nobody tells you Your Q50 2.0T runs the same Mercedes-Benz M274 engine and Bosch MED17.7 ECU found in the C300, CLA, and GLA. AMR has been cracking these exact ECUs on the Mercedes side for years — which is why we're the only company offering a genuine OBD flash for this platform. Everyone else falls into two camps: Piggybacks (JB4): clever, but they trick your ECU instead of reprogramming it. Mail-in bench flashes: a real flash, but you have to pull your ECU, ship it, and wait a week. The COMPORT iPRO is the third option that didn't exist until now: a real ECU flash you do yourself, wirelessly, from your phone, in minutes. Piggyback vs. flash — what's actually different A piggyback like the JB4 sits between your sensors and the ECU. It intercepts and modifies signals — nudging boost control so the factory ECU targets more boost. The stock calibration underneath never changes; the JB4 is working the whole time to steer it. That's genuinely well-engineered, and on a stock or lightly-modded car it makes real power. A flash rewrites the calibration itself — the actual fuel, timing, boost, and torque-limiter tables the ECU runs from. There's no intermediary and nothing steering the ECU in real time, because the ECU is the new tune. Nothing is added to your engine bay. When you want stock back, you flash back to stock right in the app. The short version: JB4 = an external device changing what the ECU sees. COMPORT iPRO = the ECU itself, reprogrammed. Side-by-side comparison COMPORT iPRO (AMR) JB4 (Burger) Mail-in bench flash Type Real ECU flash Piggyback (signal interception) Real ECU flash Install Wireless OBD, phone app, minutes Wire into sensors in engine bay Remove ECU + ship it Downtime None Install time Days to a week+ Hardware left in car None — device unplugs Module + wiring stays installed None Changes the actual ECU maps Yes No — works around the stock tune Yes Laptop required No No (Bluetooth app) N/A (you ship the ECU) Custom tuning Yes — ProTuner supported App presets Varies by shop Live monitoring / datalogging Yes, in-app Yes, in-app No Revert to stock Yes — flash back to stock in the app Unplug the module Ship ECU back Move between cars / resell No — the tune is locked to your VIN Yes — not VIN-locked, fully swappable N/A Price $770 ~$599 Varies + 2-way shipping Let's be fair — when a JB4 might suit you better We'll say it plainly: the JB4 has real advantages, and if these matter most to you, buy the JB4. You flip cars often. The JB4 isn't locked to one vehicle — unplug it, move it to your next car, or resell it. The COMPORT iPRO flash is locked to your VIN, so it's a permanent upgrade to this car. You're on a tight budget. The JB4 is cheaper up front. If squeezing out the last bit of value matters more than a real calibration change, the piggyback is the lower-cost entry point. If instead you want the cleanest install, nothing bolted in your bay, real changes to the calibration, and full custom-tuning headroom — that's the flash, and we're the only ones who make it for this car. What you get with the COMPORT iPRO Up to 268 hp / 328 tq (Stage 1, from a factory 208 hp / 258 tq — roughly +60 hp / +70 tq ) Fully wireless, plug-and-play OBD — no laptop, no internet connection required Manage everything from your phone: flash, switch maps, live-monitor, read/clear codes ProTuner supported — go beyond off-the-shelf with a custom calibration for your mods Fits 2015-2022 Infiniti Q50 2.0T (208 hp I4 / Bosch MED17.7) Requires 91/93 octane Price: $770 — or split it over time with Affirm at checkout.