Hi i am buying a 2003 airtrek turbo. Previous engine blok or piston broken. So the owner gtting an evo 5 engine lantai changed and going to sell it to me. Question is i know 4g63 engine in evo 4 to 7 is the same. But are going to be complication??? Or some technical issue going to arise. Talk to the mechanic, he say shd be no problem. Please advise. Tqvm.