When it comes to the cooling system, OEM is essential. Do not go aftermarket, except for a select few things.
Expansion tank should be OE or OEM, ET cap should be OE or OEM, hoses should be OE or OEM, and radiator should be OE or OEM.
Aftermarket things that are fine to use:
- Aluminum water pump pulley (highly recommended)
- Water pumps: Graf, Stewart, Febi
SEE SIG, DOGE IT ALL
My opinion is the opposite of your opinion, even if you change your opinion to my opinion.