If you definately know you want a blower in the future for your car, then you should plan your mods around that.
I normally wouldn't recogmend headers, due to their price and complex install, but they will definately help once you have a blower. So once you decide on the type of headers (shorty or longtubes) then that will help determine what kind of high flow H or X pipe to get. To finish off the exhaust, you can either just change the mufflers, or get a whole new catback. The mufflers you pick will have a big effect on the sound you get. The stock catback pipes should still flow well enough for a blown motor, but you may want the catback for the added flow when you get the blower.
You can get a larger MAF too, just make sure you can have it calibrated for a blower down the road.
A bigger Throttle Body will help too. Not much stock, but better with the blower.
The type of blower you get may influence your chioce of rear gears also.
If the car is a 5spd, get a shifter.
Underdrive pulleys and a cold air kit will be useless once you get the blower, so you should probably leave them off.
Basically its how far you want to go. Hope this helped.
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1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, MAC U/D pulleys, KVR front brake upgrade. 15.2 @ 91 before exhaust & pulleys. Not bad for a 3800lb auto 4.6L
No Longer own: 91 LX 5.0L 5 spd
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