It's probably a misprint. The 325i is described as having 3.0L engine in the BMW.ca site.
"Capt. Malcolm Reynolds: [the Operative has politely asked Mal to return River] You have to open with payment.
The Operative: That is a trap. I offer money, you'll play the man of honor and take umbrage; I ask you to do what is right and you'll play the brigand. I have no stomach for games. "