Does anyone know the manifold volume for an NPI manifold?

I'm working on a 97 mustang GT and I have what is supposedly stock files for a 2002 mustang GT and a 2011 crown vic. Both are PI engines and the mustang shows 9.63L and the crown vic shows 9.2L. I would think the NPI with its shorter runners should be less. The tune I read from my car, which is from an sct hanheld tuner has it set at 9.75L. I have a ZXA4.bin file (what my car has written on the ecu) I've been looking at with tunerpro, and it shows 129.59L, which sounds way out to lunch. Does anyone have a trustworthy number?