So to let you guys know, BMS made a piggyback system for our jettas. They are supposed to be released at the end of this month for the production models. I was lucky enough to buy a tester as long as I took some pictures of the install and sent back some data logs as well. I have the JB4 unit, the bluetooth module, and the app. The bluetooth module allows you to connect via your cell phone or tablet and data log, change tunes on the fly, and display a bunch of different information from boost, oil temp, throttle position, AFR's, ignition timing etc. It adds 30hp and 45tq. It's a very noticeable difference in power. It's a much smoother delivery and pulls very hard on the low to mid range. After 5k rpm it tapers off quickly do to the turbo being so small. Stock 0-60 using a buddy and his phone app ( with gps tracking ) was 8.4 sec with my 8spd auto in sport mode. After turning on the Jb4 map 1 ( for 91 and 93 octane ) it dropped down to 6.9, thats back to back testing using the same app ( which is probably not that accurate but showed improvement none the less. Car is also stock minus new wheels and the air box mod. Ill upload pics as soon as I can.