Good Intercooler cores?

I've used a couple of PWR intercoolers with great results but never used a proflow so can't comment on them sorry.

ARC make really good intercoolers. very expensive but very high quality with very high thermal performance off the shelf. You can buy cores from them then make your own end tanks, or buy one of their designed ones.

There is a mob in QLD called ARE which apparently make really good cores however i have not yet tried one, but I've heard nothing but praise from the racing guys which use their cores. They also do all the water-to-air and distributed systems also.

the reason the big price difference is quality and performance, thats why its $200. those ones are really cheap chinese ones. they sell em dirt cheap because they are cheap. Your beaten up GTR core will be better.