I find, it depends how heavy you are and how many passengers...
My (stock) G has more HP/Tonne than a TT, but if I have a large passenger it makes a large difference.. It is fastest car I've ever been in from 80 to 120, and its untuned, factory default.!
IMO, if I can spend 3/4hr chasing a decent looking boxster down the M5, up and down hills, (I got it to a ridiculous speed down portishead bridge after hitting the top of the hill at 120) with the porshe just unable to get away, that'll do from my (originally) £600 car.... ! And I've sat at 120 for an hour with no grumble, couldn't say that about my race tuned (MED) metro engines.
Keep the faith!, you have just got used to the G force and after a bit it has become normal. Drive a 1.4 astra for a few weeks and try again... Look at the shock on VR6's faces when they get flown past by a very very normal looking mk3 polo...! Makes life almost worthwile :-).
NEAL