Kinda on-topic - Guys that are running after-market aluminium radiators. I just bought one. A Mishimoto X-Line 3 row.
Comes with it's own 1.3bar cap on the radiator. Am I being paranoid, or should I not run with in conjunction with the OEM cap on the header tank?
Subaru WRX/STI X-Line Performance Aluminum Radiator, 2001–2007, by Mishimoto