Build quality basically. Poor brazing, less quality aluminium which will corrode and fall apart, design of the tubes used etc etc.
That said, you cant go wrong with trucool. They are solid sheets of aluminium pressed and joined halves together with a solid end braze. There are no fins to bend or pullout like an accordion, no way to really punchture a tube, only 2 parts vs a normal cooler which is made up of several parts and a ton of brazing...just a rock solid sh*t brick house.
Now i dont think they cool as well but good thing is if youre say a track guy and want a 34 row, trucool makes a 48 row that probably has equal cooling. And at $78 you cant beat it. My 48 row on the street is 160-180*, close to 200* if im just sittng in summer heat but just sitting no cooler will help you.
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