I dont know why Ford didn't put it in 10lb flywheels, probably for the same reasons
SVT did think about it..they reduced flywheel to 18 lbs from 21.5. Downside to less weight would be less smoothness, less energy stored for good launching from the line, less strength. Nothing is for free in car modding...
K&N filter ..mor hassel cleaning the thing for guys that do not like that sort of thing, more chance to foul MAF with oil (which happened to me and I did not even oil the K&N, just factory oiled). Power losses without an airbox vs SVT filter. K&N was used on Cobra R, Viper ACR but that is more a special case.
LSD, well they just cheaped out.
