Thanks reply. Rgding the map sensor I'm still not fully understood. Let's say now the stock engine is using MAF with stock ecu. If I change to plug in ecu, what I gona do with the MAF wire n sensor ? Leave it there.. or need to disable it with any wire cutting on the MAF. Pls guide me. As u have said, the ecu itself has onboard 4 bar map sensor it means I don't need to get vacuum line from intake to activate the map sensor function ? I'm new in this link. Thanks for ur time sir :)