It is fast as hell. They have very good high end power, but feel more laggey than stockers. Only problem is I got a bad set of turbos. I got a set of turbos with bad seals. They have smoked from the very first startup on my new motor and trans from Nissan. I now have like 750 miles on the setup and the smoke is just getting worse. Car runs great though. I need to find time soon so I can send them back to Z1. Robert said he would take care of the turbos for me and gave me no problems.