mine seames pritty progressive boost comes on erly and is thru the whole rev range, my old wrx was harsh wet from nothing to full on gave that real push back in seat feel but it was a 4wd so was easy to drive, differant story if it was a rwd, would spin every time boost kicks in, I could spin all 4 wheels in 3rd in the wet which isnt bad for a 4wd with only 157kw at the wheels