I had ARC, check
www.turbocelica.lv
Excellent quality but 550hp? No. 450 i would say
While it would work, you would get much better/safer temps with fmic.
ARC exchanges heat quickly but also heats up quick if you are not moving, so you need a fan on top of it, which also cant help enough because the IC is literally sitting on an oven called 3sgte. I also installed liquid squirters attached to the bonnet. Its pain in the ass, even subies dont do tmic at such target numbers, while their TMIC is set back behind the "oven" by a great margin..
I must admit the st185 bonnet looks cool with arc ic underneath, i like it better than RC bonnet looks
Another option is to implemet liquid co2 spray system on the tmic, but that depends on your needs because it is also PITA