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Message: <blockquote data-quote="kb1982" data-source="post: 1228744" data-attributes="member: 18723"><p>When a tuner tunes the car, they will have a map sensor hooked up to the car, but its just part of the various sensors they hook up to it to aid in tuning. A tuner sc kit doesnt include the FMU, you are left to tune the car for additional fueling using larger injectors and a getting a tune. Also in the tuner kits, the timing curve is left up to the tuner to reprogram also and doesnt include a boost timing master that reduces timing based upon boost reference. The standard full kits, they include the FMU, which is boost/vacuum referenced to increase fuel pressure, which makes the injectors flow more than they normally would, compensating for increased airflow. Here are the main reasons for going to a bov. You have to remember, the bpv recirculates air. And air that has been compressed already, has been heated up which s going to raise your IAT temps. Instead of fresh air being drawn through the airfilter and the maf, the same air is just being rerouted back to the inlet of the supercharger. The higher the IAT's the less aggressive your timing advance can be without having detonation. Also cooler air is more dense, and creates more horsepower. Plus their were a few other reasons i pointed out earlier.</p></blockquote><p></p>