I think you missed the last part of my post. I have been complaining about the Xterras power plant from day one. Its basicaly a 4 cylinder with 2 dead cylinders along for the ride but it gets the job done. The wieght difference your describing wont make a noticeable difference. No different than throwing the family in the truck or going camping.
Besides I dont run sliders and I only way 170 so im running light already and id be willing to bet the front bumper ways more than 35 pounds.