Curious tho. Why buy one of those over a plastic one?
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I think you'll find that its a calculation the ECU makes based on a few parameters; Boost Pressure, RPM, Load, etc etc etc.
It would be reasonbly accurate i'd think. Although, maybe a little bit conservative for longevity and warranty purposes.
I had an ally header tank made for my D1 back in the day, due to rumors of the OEM tank cracking. I found that it helped dissipate heat a little, I made it larger than the original tank to hold a bit more coolant, and, I had some NPT bungs welded into the side of it for my low coolant level sensor.
From the AlliSport TD5 Intercooler page in the online store:
https://uploads.tapatalk-cdn.com/201...7dbdeb49df.jpg
performance intercoolers should go on performance cars.