[andyb]

I think ,again, All 749 and 999 pipes are the same in std assymetric trim.

The only time any bore changes is if you go to an equal system ie 54mm 57mm!

The co2 will be sert as part of the 4 gas analysis, Particularly when you set up on a dyno.....this is what you are setting up.

Wait til you start talking about lamda...............