Sounds like a lot of the crap out there. You should ONLY consider a real "chip", containing correctly modified computer code, to change the operation of your engine. There are many people and companies out there claiming to be "tuners", and there are some specific questions you should ask them, before purchasing.
Ask them how they derived the correct tuning values within the program-did they test it with datalogging, and wideband AFR sampling on a chassis dyno?
Did they use a loaded chassis dyno, or an inertia unit, like a Dynojet?
How long have they been making chips?
How long have the been in the same business, location?
Ask them to describe, in detail, their process of writing a performance tuning calibration. Better yet, have them show you, if it's feasible.
How much power will it gain?
What octane fuel do I need to use?
Does it need a colder thermostat?
Look for quick, specific answers to these questions, and use your instinct in your decision to purchase.
That said, a correctly calibrated performance chip, using a 180* thermostat, on the cpi motor, will yield rear wheel power increases of 14-20, on a loaded chassis dyno. Keep in mind that the main premise behind a performance chip, is the use of premium fuel, and on that application, multiple, 3-dimensional timing curves to add the extra power and torque. On an automatic, with 4l60e transmission, will also add substantial transmission performance and durability
If anyone tells you different, they are incorrect.
jim
