Originally Posted by chief_Roka

Also in japan cars are 300 to 500 lbs lighter cuz they don't have as strict regulations on metallurgy and safety equipment. This is y this japan test is almost invalid to compare to the american Z.
That being said. Rip out ur airbag system. Add more carbon fiber/titanium n aluminum parts and u hav a japanese Z. That can change the dynamics greatly and wouldn't be surpised if the japanese Z is 2900lbs.