I have had the car since Q4 2014(brand new) and have not made any modifications to the engine. The only modifications I have done are:
1. changed the entertainment system to a ''touch screen/Pioneer''
2. changed the tire rims to 17inch
Car has a complete record with Chevrolet service centers(most of the services were done at Chevrolet Imus, Cavite).
Chevrolet have also installed a new A/C compressor and have changed all the valves. A/C unit works like new