Might also want to let Nissanman know about the Restriction of power from the Cobra exhaust.
Oh yeah, as Andy James found out... The Cobra exhausts aren't any good for FI, he had a much better experience with Miltek (I think that's what he has now) and I had better figures with the Nismo exhaust. I think it's due to the size of the rear box, I'm not sure how big it is on the 70.
edit: I would just like to add that if you're not chasing numbers, it probably doesn't matter.