Originally Posted by useless
My au with stock cam and xorst kept up with those
Didn't know stock I6 AU's ran high 13 to flat 14 second quarter mile times
To answer the question, no you don't need an adjustable vernier cam gear, all that allows you to do is adjust the power curve to suit. A nice mild cam would be a good upgrade, yeah the XR6HP cam is fine but you can pick up a fair bit of mid range and high end (depending on cam) power with some of the decent aftermarket cams out there. First thing though would be to get a good exhaust system (if you haven't already), then think about cams.