type in verso in search and you will find all you need to know on ASG tuning. I am more than happy with the tune they did on my STI. Just noticed you have a 99 sti - so verso is not available currently. ASG are good just the same. What
ecu do you have on your car? Ecukek, Unichip, etc.. sean and the guys at ASG can tune well and you will get a get service and result in my opinion.