You said they "suck", why?

Asked and answered, no?

Why not just google it yourself?

You will find technical points on their drawbacks, lots of sales blather saying they are great, then lots of owners that like them and a few owners that have had problems and some disasters.

Then draw your own conclusion.

Do you think if you keep asking, this single thread will become a complete repository on the topic????????

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I had it downloaded and installed at Auto Talent in Carson, CA. Very impressive line-up of cars at the shop. I was helped by Sam. Done 7/23/15.

Because they're a hack and that's putting it kindly. Insisting they are anything resembling a proper tune or the correct way to achieve additional power and torque is a delusion.




Unfortunately, this is not an option for X5d owners.

This is the only option and that's why those magic black boxes are so popular.

He didn't answer, hence my second question. I know all about the PB's and tunes. I had/have tunes on both my former M5 and Z06 9 (among many previous cars). Additionally, I've worked with tuners as a beta tester.

The PB's seem to work well on the diesels. To globally say they "suck" and not explain why, doesn't add anything to the discussion.

Thanks for the response. I don't think anyone has "insisted" that they resemble a proper tune as they obviously don't. As you stated, not many options for the X5d. I'm not a big fan of PB's but it does make a nice improvement on the X5.

I have a question; have you driven an X5d with a PB device?

They work as intended and increase the power, fact no one would argue with. The unknown factor is how much long term "damage" PB will cause to the subsystems EGR, DPF, intake, etc which are extremely picky even under the factory computer control.
As a matter of fact I would not think twice to install PB on a gas engine, but wouldnt do that on my diesel if i have the intention to keep it for long time.

.