Originally Posted by Xan

Guess it will be a wait and see (which makes a 10% discount before the end of this month pretty useless)

I know the pre-HR 3.5 had a restricted air flow and a spacer solved that, that's why you saw good gains. The re-design rev-up engine in 2006 already took a lot away from that and the fact that there is no HR spacer is probably a good indicator that there wasn't anything to gain on that design.
So I would be interested to see what this can do on our engine.

What intakes did you have for the test and were these included in the gains or was the baseline with the same intakes?