66 could be right... Due to the spring in the TIAL. But also has to be in your tune. During dynos Mike and I did at Black Market Racing when we installed my HPs there was no difference in AWHP.....However, when we were doing the dynos on my car during development of the DPs with PPE a few months later, Mike and I noticed the entire power curve shifted down about 350-500 rpms on the same dyno making the low end a lot stronger using stock bov's... This got even better when the tune was modified for the DPs. Bottom line... More low end pull and both usable TQ and AWHP available earlier.