Just thought it was worth a mention, I fitted my new Japspeed radiator today after the old one split on my 2004 STI.
After searching on here for correct refilling of coolant I filled the system up from the rear pipe on the header tank. This caused me a massive headache doing it like this and ended up with an airlock in the system. I had no heat from the heater inside & the bottom radiator pipe was cold.
Did a bit more digging on the internet and found from I think NASIOC a link about refilling the system which stated to fill the radiator up first to the top, replace the radiator cap then top the header tank up.
This way worked a treat with no air in the system, the heater blew hot air and the bottom radiator hose was more of a temperature I expected.

 

Good stuff what is your impression of it now its fitted,my wife was thinking of getting one and there's not much feedback on them yet.SJ.

 

Did a short review of what I thought on the group buy thread, hope that helps a bit

 

Nice one.SJ.

 

Interesting as i did a bottom hose on mine today and refilled from the turbo hose without issue. Unable to fill rad on mine as no cap on my rad