535i and 535d
Why does the 535i use the regular N55 and not the N55HP? The N55HP has about a 15hp plus than the regular N55, along with more torque. Using the regular N55 makes the 535i a tad slower than the 535d, using the N57 (2011-present version). I find this a bit odd... Why make the 535i slower than the 535d?