Don't mean to be rude or anything, Infinity G35 Coupe has just come out with 3.7L engine which puts out 330HP. I will bet this engine will be available in Nissan Maxima and Altima very soon. Besides, most of the 3.5L engines out there (Toyota or Nissan) can provide close to 300HP. So, 3.5L with 268HP is nothing to be proud of.
