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If you have replaced the top already, don't worry about my #12. The 3 bow top is the earlier style up to 2002 which was more aerodynamic and had a sleeker profile. When the factory switched to a glass rear window in 2003, they added an extra bow to the top in an effort to preserve some engine access with the inflexible glass window. But if you have an aftermarket top added to your original top frame, you will still have the 3 bow frame.
As for UDP, it is an underdrive pulley, which decreases parasitic drag on the engine by decreasing the speed of the serpentine belt powering the accessories, and thus nets a slight increase in available horsepower for not much $ & work, at least compared to other mods for power. Perhaps more importantly, if you start using your car for events where you are sustaining high rpms, an UDP will significantly decrease the wear and tear on your power steering system.
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