Just about all vendors have the same price. If you really plan on racing and making things work right do one of 2 things: 1) get Direct Scan and a laptop and really learn to read the ECM, or 2) Get TurboLink and a laptop and let T-Link teach you how to read the ECM
Ken if you read this, please understand this is not a slam on T-Link but a compliemnt. I would have never learned to read DS without T-Link