Selling a used Eurobahn Split Second Turbo Tuner out of an 08' 335i.
$180 obo
http://eurobahn.us/theturbotuner.aspx
"The Split Second Turbo Tuner is a reasonably priced option to increase horsepower and torque output, and the fact that it can be removed easily makes servicing at the dealer less stressful. The Turbo Tuner is installed between the ECU and the TMAP sensor, providing a mild increase in boost pressure. Performance gains are not limited to any specific part of the rev range; can be felt throughout without a single hiccup." -- europeancarweb.com