[DannoXYZ]

Note that the most efficient coatings are dull and not shiny. Also not recommended to coat inside because they can't clean and spray coating very far inwards. The partial coating will flake off and destroy your turbo.

People have gotten around 300-320whp from a K26/8. And about 400wbp from a K27/8. Just a matter to stacking the appropriate mods and dyno-tuning.

Forget about any mods that retain the AFM, waste of time and money. Go straight to Rogue's M-tune with MAF. Easy +50bhp at stock boost levels. +100bhp by raising boost along with free-flow exhaust.

Also good idea to upgrade spring in factory wastegate. It starts opening around 3-5psi, fully open by 10psi. Better to increase spring to start opening at 10psi, fully open at 15psi.