when it comes to overtaking ability i think we could all attest it boils down to the car in front which one is trying to over take and at which speed and gear the overtaking is about to take place.. although say a 911 Carera S sits lower and lighter than an IS-F, the 911 will not accelerate any faster in an overtaking manoeuvre if it happens between 50 to 75mph as they both achive it in 2.4 - 2.8 seconds in fact the IS-F has been tested to achieve 4.5 seconds from 50-70mph in 5th gear compared to the Carrera S's 5.9 secs in 5th when trying an overtake manoeuvre. even a 335d BMW is quicker(4.7 secs) in 5th gear between 50-70mph compared to say a Carrera S overtaking at the same speeds in 5th. so will all depend on the car in front one is trying to overtake.. but the Porshe looks to fit the bill perfectly in terms of what you kinda looking for ..Lol u certainly do your research mate ,some say train spotter or plane spotter ,hmm your defo car spotter lol