"Anyway, what was surprising was seeing how much extra power was made by lifting the top of the air filter up... a Manual I think PSI04L's, peaked at 201kw, and when the air box lid was lifted up made 206kw. A 5kW increase!!! I think in the end, with a pod filter it increased to 204kW?? I'm sure more will be said about this." This is very interesting. When the test was performed, was the air filter still attached to the upper half of the air box? In other words I'm trying to determine whether the 5 kw increase was due to the combination of a lack of an air filter and a restrictive air box or just the lack of a restrictive air box alone.