I've pretty much reached the limit of the stock turbo. At the moment it's holding everything back.
There's a turbo back mandrel bent exhaust, a 4" FMIC, Apexi PFC, Blitz boost control & fuel pump among other things. For a more detailed list follow this link.
My next step is to get a bigger turbo. I'm thinking a HKS 2540 but as this is $$$ I might get a T4. I've seen a setup where the turbo comes on at 2500rpm. It was pretty impressive.
What kind of a gain would you get from an external wastegate? I haven't made my mind up about ext/int yet.
At the same time I might have to get injectors. Either 555 or 700's, depending on $.
After all this it might be plausable to get a plenum made up. What do you think?