Greddy coupler question.
 

What is the size of the coupler coming off the turbo to the intake pipe? This is using the stock Greddy intake pipe.

That was the only one that I didn't get a correct sized replacement for when I did the install. It's much longer than any of the other couplers.

a little under 2.5", I have a 2.5" on mine.

The outer diameter of the turbo's compressor outlet, which I believe is what you're asking about, is ~2".

The outer diameter of the throttle body inlet, which I believe is what Koto thought you were asking about, is ~2.5".

edit Or did you mean the compressor inlet? That one's an oddball size in SAE terms, but 2.5" will work.

See, I think I have a 2.5 inch around here, but I don't think it is as long as the one that is on there.

I'm asking about the coupler that connects to the pipe that leads to the airbox so I think your first option.