well thats really hard to say, the last time a went to the track with my car i trapped 106 which tells me i should have a little more than 300 at the wheels

i decided out of the blue to take it to a dyno one day and found out with 15.4 AFR's i was making 281 rwhp

so my estimate is in the 20 hp range but it really depends, because i was losing power from being lean, and probably losing power from the computer pulling massive amounts of timing since it was so lean.

All i know it my car runs a hell of a lot more solid now, and im looking for another day off to dyno it again

 

If you assume an average fuel pressure of 22.5psi at WOT, your engine was only getting abouty 72% of the fuel it was supposed to get. For example, if it was tuned to run at 12.8:1 A/F ratio at WOT, it was actually seeing about 17.7:1.... running that lean, it would have been pulling max timing, up to 15 degrees, depending if it was tuned as something different than the stock upper limit.

You are really lucky you didn't destroy the engine with detonation.