HI GuysI think yours expert enought with M20 Engine. Need yours advise on the M20 2.0(M) upgrade to M20 2.5(M). Below is the item that i have at the moment :-1) M20 2.5 ECU2) Engine Blok without Cyclinder head.3) Air flow meter.4) 2.5 full Ekzos system.I am thinking to look for Cyclinder head and cam which is very costly full M20 2.5. Since i didnt have Cyclinder head. can i do like below:1) fixing the all item and use 2.0 celinder head.or 2) fixed item 2). only, other use 2.0or 3) other option (your suggestion).Please help.