After watching this I watched some of the other ones that are linked on that page. Nothing and I mean nothing including a blown 2500HP sounds as good as a HEMI. The Hemi is on the '05 Speed o Motive vid. From aroung the 26 sec mark it sounds like an entire NASCAR track all rolled into on engine.
Oh yeah, very nicely done engine run-in stand. Nicely shown and explained too. Thanks for the link.