ive had the ko3s on less than a week and loving the power...feels like a new car. Search and read through the threads...there are alot of them concerning the ko3s upgrade, and are filled with everything you need to know to do this upgrade. But id say its worth while doing despite what some people on here say.
Ko3s turbo
Uprated dump valve
TIP
Uprated air filter
Turbo back exhaust
Front Mount Intercooler
And a suitable Stage 2 Map - Revo, Custom Code, Jabba and a few others