Which is exactly what i said on the dyno run thread, but you seemed to think the numbers accurate, i quote "he wouldnt be in business long if his readings were that far out", well he was only 50% wrong on the increase from Horshams dyno
So you honestly think 25hp at best will transform a 1.5 tonne car, night and day as Zippy says, sorry, thats utter tosh, the biggest single factor will be the removal of the throttle restrictions in the first couple of gears
The op wants to know what hp gain he will get, so after the many many many discussed threads, pay zero attention to hp from a dyno, or as said he could be a very unhappy bunny, just appreciate the better drive (bum dyno)