I bought my early 260z a few months ago. The first thing I did was change the struts (KYB's) and installed Eibach springs. Tires had about an inch gap,look real good. The ride was wasn't so good, I could feel every bump and road marker, even bottomed out a few times. The exhaust smell was also real bad so I sealed everything up, tail lights, drain plugs ect. I got tired of the rough riding so I put back the stock springs. It raised the front end 3" and the rear 2" now here's where it gets weird, the exhaust smell is gone. I've been using a CO detector in the car the last month and it would read in the 50's or more and now just 10ppm. Must have done something to the arodynamics!