Porsche/VW Bluetooth Programmable 4 cyl with/D-Jet. Includes spacer.

Good: Manufacturing quality and ease of use is high, installation is straightforward, and the mechanical fit, form, and functionality of the unit is good, and a nice upgrade over the stock unit. Manual includes clear instructions for install and setup (although it doesn't detail the fairly simple but not entirely intuitive D-jet integration). Bad: The app is fairly unstable, and particularly prone to fail to reconnect to the distributor after the car has been running, which is annoying, and sometimes disconnects mid-flash, resulting in tunes that are very broken, potentially with overlapping functions, so be careful to double check your read after writing a new tune. The app also allows you to select your units of preference, but only changes them on the dashboard display, still requiring conversion on the tuning screen, which is also annoying. Not yet determined: My vacuum advance curve is not behaving as described, and even seems to vary in behavior over the rev range of the engine. Currently working with Albertronic support to attempt to diagnose the issue. Could be user error, a firmware glitch, or failed hardware out of the box.

superb performance with this product.