Selling a used SprintBooster V3 for E46 330i. It works great and includes all accessories, I just don't need it anymore.
This video shows how it works: https://www.youtube.com/watch?v=8u7lIJfWc6U
There are lots of helpful reviews on Youtube to give you a good idea of what they feel like to drive with. It makes an immediate noticeable difference in throttle response.
I'll post pictures of my device tonight or tomorrow.
Asking $130 or make me an offer. Thanks!

-Ethan