HKS Hiper and Trust Induction kit i believe.....
Thats really good Pete! I think with this post you have answered a lot of questions that some people will have....people that want to keep their IS N/A but get some good power gains!!
If you had put the three mods in together, all at the same time, you would have really noticed the difference!!
Now if you were gonna keep it N/A...lightened flywheel, HKS spark plugs, remove the pre-cats...to name a few suggestions, and the car will be pretty sharp in the world of N/A me thinks.