I think a lot of folks are looking at this as a HP gain when that is not necessarily the benefit I realized in my E39. Much like a lightweight flywheel- no actual HP is realized- the removal of a parasitic draw allows the engine to work with less effort because the clutch is gone. In my E39 over the past 8 years, this translated to faster trips to the redline. I found that I would actually hit the rev limiter even before the RPM gauge said I should be there.

Not only that, but the engine revs the *other* direction (down) much more readily as well. That may not seem like a nice thing, but consider how much more readily I can rev match with a manual transmission. The engine speed is much easier to manage manually.

Of course, few v8 E53's are going to be manuals, but the engine moving up and down the rev ranges more easily is still a benefit realized by the automatic transmission not waiting as long to shift when necessary.

I probably gained zero HP from the electric fan, but I can get *to* the HP I have much more readily after the install.

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