It's an excellent mod. Buy the KPro and get Jim Russell to fit it and tune it for you. He's the guy who is tuning my teg currently and he is based in Waterford. There are other places around the country with varying reports. Some people have had good experiences, most have had nightmares so I won't even name these places. If you want Jim's number, let me know and I'll pm you with it. You'd get best results out of this with your exhaust and induction etc. but because it's programmable, it's no problem. Just reprogram it whenever you add a new relevant mod. Plenty of people on this site have them fitted and the consensus is excellent in general on them.