Ok so I have a mk4 gti 1.8t with 200k on the clock but all major components have been replaced including engine but it has developed some problems and at worst could need a new module drivers side (i think) new ecu and a new maf oh and a new battery or do I buy a different mk4 and swap all good parts for example front mount intercooler piper cross air filter alloys blacked out windows and seats if need be
