is tuned right can still take them. My old 300ZX had the intake, computer, exhaust, mid pipes and pulley and I was running consistent 12.8-13.2 all day long at 106-112 mph. with street tires (thus the C5-KILLR name then). They are quite fast, you are right, but my new Z still likes having a snack here and there...burp! She specially likes the yellow Z-06's, taste like expensive candy. :)