I found 3 graphs here in Quebec coming from the same dyno.
V7, Ecutek, 91 octane, headers stock, uppipe lachute, downpipe lachute, midpipe WRX 2004, axleback STI
V8, Ecutek, 94 octane, stock sti exhaust
V8, stock, 94 octane, 3 inch catback
What is strange here is the difference in spool up between the two V8 setup