its starts spiking then dial it back down just below that point. At 80mph down shifting to 4rth will get me to 18lbs in a sec or two with z1 600's. the stockers should do the same. The exhaust may have made a bit of a difference but not noticable with your mods
I would have someone familiar with Z's look over the car with the idiot mistake the previous owner performed on the car.
I do not fear what the future holds for me, I am not afraid to die.