For those who have Si's and are looking to go turbo and want a good kit read this!

[Racing Rice]

Either way you look at it, if your going for that much power then get the Drag Kit, RevHard kit, or Fmax kit. All three of these kits use the T3/T4 combination that are all good for 550 hp. Dont limit yourself to the 420 HP from the Greddy Kit, it your going to go through all the trouble of building up the motor, you should go with a turbo that you can get more out of.

That my .02c anyway.