So beginning with the 2003 model year, Ford re-programmed the 3.9 liter V8 and added variable valve timing (VVT), to boost the engine’s output to 280 HP. Why the change? Some owners and reviewers felt that the 2002 Thunderbird was underpowered at only 252 HP. The 2002 engine is rated at 252 horsepower, while the 2003-2005 has 280 HP, roughly a 10% increase. The 2002-2005 Thunderbirds all came with a 3.9 liter V8 engine. Let’s discuss power/performance upgrades first. In addition to power upgrades to add more horsepower, torque and better acceleration, there are also suspension upgrades for improved handling and better ‘road feel.’ So you own a 2002-2005 Ford Thunderbird but aren’t completely satisfied with the power and performance? What can you do? The good news is that there are a number of aftermarket performance upgrades for the 2002-2005 T-Bird, and most are simple and relatively inexpensive ‘bolt-on’ modifications that don’t require any permanent change to your car.
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