According to Mine's the engine was not bored for bigger pistons to preserve the reaction,which was posted on youtube. and it showed to be true,the rpm was revved up from 4rpm to 8.5rpm in mere miliseconds. but contradicting this are those stroker kits offered by HKS(2.7L) and Apexi(2.7 or 2.9L) kits and also the RB30DETT offered by tomei(Which needs the engine to be bored to fit in bigger pistons). which i think is also awesome cos i had a chance to sit in a 2.9L R34 GTR tuned by a well known local tuner. i felt that the response was not as i thought it would be. and the lag was there,but after 2 seconds everything kicked in and it blew me away. even with the power that these stroker kits offered,i was more concerned about the reaction of the engine. this comes in when taking in corners and i wouldn't want to have the stroker kit mess the traction jus because it stroker kit didn't respond quick enough.
So my main doubt is,wat are your comments on this subject? once the decision to bore the engine,there's no turning back,but in return more power but less response.