See web site http://www.carperformancechipreviews.com/ and specifically the following
8. G-Force Car Performance Chip - GforceChips, GFchips.com Reviews
Ordering Process: 1/5
Shipping Speed: 1/5
Customer Service: 2/5
Return Policy: 1/5
Average HP and Torque Gain: 1/5 (For each vehicle tested we noticed a loss of 8-15 HP)
Average MPG Gain: 1/5 (We notice huge losses in MPG. These varied from 3-10 MPG.)
Cost of product: $69.00