I am very interested in the Velocity for my E90. (
http://www.pyspeed.com/product-p/rd-8010.htm ) It appears to do what the Sprint Booster does with the additional advantage of being highly adjustable with four maps (settings). Like Sprint booster, it is a very quick and easy install and de-install. The only other viable option that deals with the problem of the annoying throttle lag, that I'd like to address, is the BMS Powerbox. The BMS Powerbox gets strong reviews on this and other forums. My problem with that product is that its install/de-install is much more complex and time consuming. I want to be able to de-install easily so that I would have no fears (about getting caught violating the warranty) when going to the dealer for service. Anyone on this forum have experience with the Velocity Adjustable Throttle Booster or does anyone wish to weigh in on this subject? I can't seem to find much in the way of product reviews. Thanks.