Performance Upgrades for 2000 WS6
IMO the "best" 3 mods for an Fbody would be:
#1) Koni sport shocks - night and day difference in handling, control, balance, feel, and ride quality. Think BMW 3 or 5 series, firm but not jarring and always connected to the road like glue. No more snap-oversteer, jittery jerking over uneven pavement and bumps, and the car becomes very neutral in turns. No more floating and bouncing at higher speeds and that feeling of disconnectedness. This is such a great mod because the factory shocks are so down right horrible even when new, easily the weakest link suspension wise.
#2) Better brake pads and rotors - another weak link with our cars, the factory rotors like to warp pretty easily, and the pads are pretty mediocre. Go with some NON-DRILLED (they do nothing for performance and only weaken the rotor to the point of cracking) quality slotted or blank rotors and hawk pads.
#3) Tires - the factory goodyears are ok but you can do much better for much cheaper (like Nitto NT05s), much stickier tire with slightly stiffer sidewall.
I don't think any of the listed are TOP 3 upgrades except for the exhaust and tune.
A cam will give you the most power gain. Get a good cam (and necessary valvetrain) and you can't go wrong. Also, throw a stall in there and you'll be happy.
so as far as the TOP upgrades go; Cam, Stall, Headers, Tune. I know that's more than three but those will def get you a faster car.
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You may not get cracks on them with street driving or drag racing since thats not very hard on the brakes (before you argue, after a drag pass you do what, about 10-20 seconds on braking? Then the rotors have plenty of time to cool as you loop around to stage again. All the big name companies advise NOT to use their drilled rotors on track cars, and suggest blank or slotted for that use.)
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and its my daily driver and i get anywhere between 24-27mph highway. just as good as any crossover vehicles that are right off the lot. 

