ALL YOU REALLY that you cant make or get for cheap is the exhaust manifold for the 420a and a FMU.

The rest is piping and exhaust.

-intercooler piping
-dsm intercooler
-dsm bov
-3inch exhaust
-14b or t3/t4
-adaptor plate
-fuelpump if wanting extra reasurance

Just do it! 1000$ and you can get all the parts.