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I get a random CEL about once or twice a week, I clear it, and it's fine. I notice some weird down shifting jerkiness from 2nd to 1st. Overall yes the car still performs better than stock, but to me a JB4 is just a band-aid solution and we could be seeing much more impressive numbers with a...

Can't believe we're still waiting on the unlock. Especially with all the new M3's and M4's out there now unlockable as well. So ready to rip this piece of shit JB4 out and never look back.

I ended up getting my dealership to install the Visconti part and it worked like a charm. I would say to anyone who already has or is planning to lower your car at all, save yourself the time and just buy this to install when you swap the springs.

Interesting, just went ahead and bought it to save myself the headache of another plastic one breaking the next time it goes on a dyno or a lift for an oil change.

Turns out it was the ride height sensor bracket. It must have snapped when they put the car on the lift to do the oil change. They tried to blame me lowering the car but I reminded them I had no issue or warning until after they changed the oil. Had to order a new one from Germany.

I definitely want to hear more about what this thing can do....

makes me so sad to have a 6/21 with no tuning available. this is an amazing car when the potential is able to be unleashed.

I just got this chassis error today after taking car in for first service. I’ve had the car lowered 2 months no issue but of course take it to dealership a for simple oil change and BOOM code on the way home. turning the car off and back on causes it to go away then comes back within a couple...

No I have a JB4. And to my knowledge, no, I don't notice any difference in power. CEL pops and I'm like "Great...", next time I stop the car, turn it off, diagnostic mode, clear CEL in JB4 app, start car, keep driving. It's a weird code too (104301).

Mine comes back very randomly. I won't see it for a week or two and then it will pop up. Put car into Diagnostic mode, clear, and its good to go again. Could be same issue, who knows.

Oh yeah, no doubt I came in as a newbie to tuning. I have a shop I work with and they are installers and have done JB4 installs before but they definitely are pro's in the sense that they are going to sit there with me and help with my logs. Kind of on my own there. Another reason why I'd much...

Well, that's a huge relief then. The app has cut out on me before in bad reception areas or when I had my phone too far away from where it's located and I was thinking to myself "wow, if this reverts the car back to stock when its out of range that is some bs"

I was under the impression that with the Bluetooth kit I needed the app connected for the tune to work. You're saying it doesn't need to be on? And again, it goes back to - why wouldn't I know this? Oh, because it's a tuning platform completely run on a 20 year old internet forum where people...

i'm already tired of having to boot up the app and connect it every time i get in the car. sure, it only takes 10-15 seconds but it's still obnoxious when you get in and out of the car multiple times running errands etc. i just want to drive, not fiddle with some fucking app.

Stock for stock they would've been pretty close. Any mods on either would've done it.

Honestly part of me wishes I would have waited and got a PDK GT4. With a NA Porsche I wouldn't have been as power hungry trying to add mods (and upset when I found out that I was limited with an unlockable 2021 ECU). The GT4 is running 0-60 3.4, Porsche really nailed it with that car. The...

I can't speak for the Toyota as I have a Z4 but I've had a couple of CEL's with my JB4 that I had to put the car in diagnostic mode and then it cleared. Came back a couple of times but I'm going on a week now without it returning. It was not due to the DP either. Using the AA catted DP.

Not yet. Still trying to find some additional feedback. It wouldn't be the first time a car went to a bigger turbo without a custom tune. You'll still make more power, it's just a question of how much and if you consider it to be worth the investment. Would really like to hear from one of the...

Ha I'd hate to see this especially if you're on a 21 using a piggyback and some bolt ons, god forbid BMW/Toyota blamed you and say you've voided your warranty and they aren't going to help.

Think I'd only trade up for a GT4 / Sypder 718 or a used M8. Trading a 20 Supra for a 21 M4 is trading a tuneable ECU for a non tuneable. Boo on that.