Near Crystal Palace we,re virtual neighbours ! I too had power or super flex bushes fitted to my previous 12v, can't say I was too happy with them. Ruined the ride I think, way too harsh.
No idea re roof rack, never had one myself. Lucky escape with no damage, bet the bloke behind got a bit of a shock !
I too get the ocassional bump from the front haven't had a good look yet, only had the car a week, but I suspect bushes. Just hope its not the steering rack bushes, I hear they're a nightmare to replace. BTW, do you use the 164 forum ?
Alfa gtv 2.0 ts