great product! PROS! the pms is a powerful tuning tool...and it does exactly what is saids it will...its a piggyback/stand alone system in one... its easy to use and can be installed in 1hour plug and play! i use it to tune a NOS dry kit on a 94 cobra...in the standalone feature the pms ignores the factory ecm... so in a nutshell!!! you have full control of fuel/ignition threw out the engine load and rpm.... CONS! if you are tired of chips and your a first time tuner that wants to learn how to tune your own horse... then this product is for you! BUT!!!! its not a magic stick...and its not an overnight thing....it will give you great results as long as your willing to learn the in and outs.