You guys should not be hung up on psi vs. whp.
There are a few variable here. One that is mostly overlooked is the type of dyno used. DJ is somewhat the industry standard, but there are other dyno brands that will read a lot lower than a DJ, and a few that will read a lot higher than a DJ. So the power between the lowest reading dyno out there and the highest could be as much as 20%. In the end, each dyno is a tool used to tune a car, and the best way to find out the power a car is putting down is take it down to the drag strip, and make a few runs.
There are other things to keep in mind as well. Fuel (especially race gas vs. 91 pump gas), weather conditions/temperature can play a big role, as well as the tuner himself and the way the dyno is set-up. Some tuners for example do not feel comfortable exceeding 420ft/wtq on these engine, and other are more than happy pushing things much further than that.
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