A blower is a supercharger or turbocharger, basically anything that acts like a hairdryer on your motor.
As for the PIH, it's the harness that allows you to put an older A9L processor in your car inplace of the crappy J4J1 that the cobras came with. It's kind've pricey because you have to buy a ignition system (msd, etc....) to go along with it, you also have to get a mass air meter for it to work right. So all and all it's pretty costly but a lot of people are happy with the way it works.
Nitrous is a good cheap way to go, except if you have a heavy foot and leave the bottle on you're gonna spend a lot of money refilling bottles. There's also tuning involved in a nitrous system, more so in a wet system than dry, that's about all i can tell you about nitrous, i don't use it, i just want a vortech  .
Don't think i've forgotten anything, hope this helps.
RYAN
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94 cobra, steeda tri-ax, bbk longtubes, dr. gas x pipe, eec tuner, ultra flo's, 65 mm tb, underdrives, 75 mm MAF, homemade CAI, steeda #19 cam, Steeda LCA's, 3.73's, subframes
13.7 @ 103.03 before cam and gears
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