There are plenty of 325i owners who've dropped a lot of money on upgrades that only gave them 10hp max (exhaust, intake, etc), so I think it's safe to say they're willing on spending 1500 for +50 real horsepower...
If you have some documented cases where you could show concrete evidence that this 325i to 330i transplant works, then I think you'd have a ton of people lining up. So far, we have nothing because of Finn's AWD Steptronic car.
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