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I would see the benefit like 5-6 years ago, while the E9x still expensive.
Like a rare optioned 328 or a E91-US, could make a nice upgrade without changing the engine.
But the price need to be low, since a N52 can have very respectable numbers with a upgraded intake manifold, full exhaust and a tune.
I'm at around 70% of putting back a N54 in my wagon, and it is expensive and time consuming. I went the easy way, which was buying a complete 335, and I wanted a low mileage one ''while I'm there'' you know. So 2 cars + mods while Im there + maintenance = I'm around 20k$ cad. And my E91 I paid 3500$ cad...
Expecting to sell around 2-3k$ of parts in the process.
Can be cheaper if you simply swap a high mileage 335, but it's a reported cost with a N54 for sure !
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