hi all  after a new car  not sure of what to buy impraza wrx (09 plate ish). focus st mark 2 facelift. mazda 3 mps  not sure which to go for. I guuess whichever one I see a really good one for good price ill get. 
but my question is. if I buy a wrx impreza.  will I be able to modify or change the rear bumper to sti spec for twin exhausts. as twin exhausts have really grown on me lately 
my plans for the car (whichever I get) will be to remap. fit preformance pannel filter and fit a catback exhaust to make it rawr. apart from that just grt the car looking nice and spotless. nothing to extreme. 
thanks for your time