The cheapest and safest way to boost up your car is to add a boost controller and a piggy back ecu upgrade. I use the Blitz SBC-iD boost controller and try a GReddy E-manage. They are pretty easy to work with. but dont go much past 1.2 bar or so. The stockers can and I have done it but dont recommend it. I have put out 1.32 before but only for a second until I realized what I did. Then I turned it down. It is real easy to get excited and overboost.
My bad, I assumed he had an R and didnt read the rest of the thread, just the main question, I am sorry about that guys. I paid 35000 yen for my e- manage and 5000 yen for my support tool. That works out to about $400 US and thats not too bad compared to Power FC and is nothing compared to an F-Con. But yes, they do require a laptop and I failed to mention that. I am sorry for the miss information guys.