if you are running 93 octane 750cc or bigger should be fine. I don't see a header or exhaust listed I would recommend replacing both. The Merc racing bracket I don't think will work on our cars as we have EPS. You can look into it though. he responds to email pretty quick. I ordered the JRSC Tensioner from Moss minus the tensioner itself. Also you will need a clutch and as from my thread I would add engine mounts to the list. Last but not least you will need to run an aftercooler or meth injection. I wouldn't run the M90 without cooling.

Bottom line is that you can't put a cap on your spending limit because with boost it's never ending.