Originally Posted by JETmn
And the N54 has bigger turbos (supports more HP) so it should have more lag. Or are you saying that with identical sized turbos the N55 would spool quicker?
The N54 has very small twins and with both cars having a VERY similar power ratings from the factory. BMW was able to get to faster spool out of the single by sizing it very very small. Of course a bigger single is going to have slightly more lag, but it will be far from "lag heavy"