I have a 91 z32 TT, she has dropped an injector, the ones in it are brown. I have been given some grey injectors but want to triple check the cc rating of the two colours before i chuck them.. cheers

I would send them out to RC Engineering (http://www.rceng.com/) to be certain. I don't remember seeing any posts on Twinturbo.net about OEM grey injector tops but the color could have easily faded with age and exposure.

Where did you get the injectors from?

Was talking to a guy on 300zx nz site and he had them spare in his shed - said they were definately off a TT .. just dont want to go by his word alone and end up losing a piston or something.

Wellington might be a bit far to ship the injectors to RC. Probably want to check for a NZ fuel injector testing facility.

The "Brown" injectors you have are the 95-96 injectors 370cc..... They were originially red topped. The Grey ones are the 90-94 injectors. They are not interchangeable unfortantly. I just happen to stumble accross your answer while looking for a fuel pressure regulator for my car. They are for the TT though.