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E39 radiator. Which is better?

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Hi all. Battling through the 'resto' of my E39 touring. Doing the usual M52 maintenance as well. I noticed the radiator is the built-in-expansion-tank type that I'd only ever seen on 318tis'.

Screenshot_20220110-220032_Chrome.jpg.372e17e0e6d035a004181e86f98a8363.jpg

I've seen other 6 cylinder E39s with the separate expansion tank that mounts to the shroud.

Screenshot_20220110-220106_Chrome.jpg.0e8415cac0ac2efe7acaa8e1b05cbe9f.jpg

My question is, is one better than the other? The built-in version is the same height and thickness but is 520mm wide vs 650mm. I can't seem to find much talk of it in the forums. I'll be replacing all of the cooling components bar the radiator if there's no gain from swapping. 

Thanks everyone! 

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Both have their positives and negatives but prefer the older style myself purely from ease of working on\access point of view. I wouldn't think you could use the newer setup without fiddling around with the wiring\plugs and coolant lines given the M52TU\M54 is different from your M52    

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Not sure which ones but alot of 328s have the top set up, mine does. I think it's a nz new vs Japan but not sure 

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