i have had a catback on 07 wrx for almost a year now and been thinking of getting a downpipe for it to get some extra power. i have been reading some stuff about it and i find that i cant put it on my car unless i port my stock wastegate on my turbo AND get engine managment. Or i get a upgraded turbo that already has the ported wastgate

Any suggestions? And does anyone know how to port the stock waste gate on a stock turbo?