hi, i recently changed my radiator to an aluminium civic one. my bottom hose was spot on, no kinks.. but my top one was another story. slight fiddling and it's flowing freely..
one side effect i have noticed so far is that my engine bay temps have risen dramatically.
radiator gets HOTT. but will soon be installing a reverse scoop and raising the rear of my bonnet to also help vent excess heat.
invest in some heat wrap for manifolds / exhausts too