years back..i have difficulty deciding on which i/c to complement the holset turbo i use.
finally settle with Evo 7 i/c. i choose evo7 i/c for weight saving, proven design,reliability and it's made by Koyo. (koyo... reputable in making radiator and i/c).
using oversize i/c surely give extra weight. with such power at 1.8bar, evo7 i/c did the cooling job well. balance between weight,cooling effieciency&reliability.
boost up to 1.8bar ..no problem