Paid $800, but it retails for $1200. It's been used on a few runs so we will sell for $600 plus shipping. This unit is perfect for blown LS1s in the 450rwhp and up range. We're selling it because we're completely changing the car.

TSI is an engine management software program used in a laptop computer that rides piggyback on the GM PCM. It is designed for high performance LS1 using unleaded fuel. It gives the user the ability to program and control timing, fuel, air, etc. and is a huge improvement over the stock pcm.