I live in Kuwait, I have a 2007 STi Middle East based and I just added HKS SSQV BOV, APS 65mm CAI, Megan exhaust, Headers and downpipe (ALL MEGAN). I'm having problem with my RPM, its not stable on idle. I went to an STi performance garage and he told me that he can dyno tune my car without the need of installing an engine management, and I went to another garage and he told me its a must to install an engine management to tune the car, but the first one told me that he have every thing needed to tune my car. Now I am confused and don't know what to do, do I have to buy one of the engine managements to tune my car or is it true that there is a way to tune the car without engine management (with a specialist)....??