2005 Cadillac STS – performance chip products

Dear Doctor: I own a 2005 Cadillac STS, 3.6L V6 with 75,000 miles. I have been the owner for 3 years and purchased it certified used with 14,000 miles. Although the 22-23 mpg average I am getting is acceptable, I would like your take on performance chip products. Are there any pitfalls? Also, the dealer has replaced the timing chains (62,000) in this engine. I have always felt that the shifting in this drivetrain has never been consistently smooth since I bought it. The dealer says that all updates are present and that the car is operating correctly. Donald

Dear Donald: Most aftermarket performance chips bring out the best driving experience for the driver. The performance chip or computer download can reprogram automatic transmission shift points and firmness, ignition timing and lower coolant fan temperature operation. I have downloads in all my vehicles, including my trucks. Other options to consider with the computer performance upgrade would be a low temperature thermostat, performance low restriction exhaust and cold air intake system. The only drawback is premium gas is required in most cases.

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