Locally there are 2 JRSC civics doing HPDEs. One of them was dyno'd before and after a track session. Before the session the car made IIRC substantially MORE hp, than after the session. This was attributed to heat soak.

I have a friend in CT who had a JRSC 5gen Prelude. He said that after anything more than 20-25 minutes, it was useless as a power adder.