Hi all.

I have been missing for a while, but I have rekindled my interest in my car. I have a R33 s2 rb25det. I bought a japspeed exhaust manifold and I am wondering what size flange it is. The guy said he put a standard turbo on it when he had it. What is the standard flange size. I'm looking for future reference with regards to uprating my turbo. Thanks.