Originally Posted by thejean
VF39 will spool almost as good and will give you power all the way to 6000 rpm. That's what I'm going with. JC
On that note, if you compare the 39 to the 18G, the spoolup is almost identical, with an even better topend. In the i-speed dyno runs, the 18G actually hits a higer peak boost sooner than the VF39.