Well, let's see if I can go thru this point by point:
1) $350-400 is correct, depending on how well you shop around
2) Other than possibly shortened tire life and reduced fuel economy if you keep your right foot planted, there is no downside to driveability. If fact, the overall driveability is improved due to increased turbo response whether partial throttle or WOT.
3) You can get away with regular unleaded, but 91 octane is really the way to go if you want to get everything out of it.
4) Performance gains are 15-25HP, depending on whether you have a 215HP '03 or a 220HP '04 model and whether you choose to claim the high or low end of the 235-240HP numbers given. Plus the improvements noted in point 2 above. Unless you're like me and added S1 to a 180HP Turbo Lite, then jumping immediately to 235-240HP is a real eye opener!
5) No mandatory mods, but a nice air intake and exhaust couldn't hurt!
By the way, if you're looking to install it yourself and you have an '04 it's downright simple. All in all a great mod for $350.
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