Having said you have a 4a-fe, then I would suggest looking into swapping in a 7a-fe. It has almost 200cc over the 4a and roughly 15 more hp. That being said, there are more mods available for the 7a. I'm running a 4a with a header, high flow cat, high flow muffler, short ram intake, ngk denso iridium plugs, 10.2mm wires and I'm probably running 115-120 hp (optimistically) And if you are dead set on a turbo, then I suggest looking at these. sfx Performance has kits that are decent prices. You'll still have to check fitment though. Anyway, I hope this helps you out.