usually the 17 or 16 cm is the measurement of the ID of the entry inlet of the turbine housing. they are off a little bit all the time because of casting, but you can just measure it and find out.

 

What do you mean by the ID of the entry? Are you talking about the turbo flange entry? What exactly do I measure to find out?

 

You measure the inside diameter(ID) of the intake hole on your turbo where the intake attaches too.

 

the measurement is not on the intake side. The 16cm or 17cm is on the exhaust turbine side. Its the Mitsubishi way of specifying the area to radius ratio, like the Garrett turbos. To measure it will require the removal of the the turbine housing, and the "nozzle diameter" will corespond to the size of the turbine.

 

What part of the turbine housing is the "nozzle" where I can measure? I'm not getting what you are saying as you can see

 

Hey Setzep, where did you purchase this TD07-25G? I know that Greddy does not carry them in the US but only in Japan. I wanted to go with the TD07 but had difficulty finding one. Thanks.

 

I bought it used/rebuilt from Bryan at BNR supercars. It was on his daily driver (FC) but he decided to go with something a little smaller so he sold it to me. Not sure where you can get them new but I know there is a place somewhere on the net. I was on the site once but can't remember what it was called, I think they were going for around $850usd new.