I am thinking about installing an aluminum driveshaft but don't know if it is worth the money. I really don't have much vibration from my stocker but was looking to lose a couple pounds of rotating weight with the aluminum shaft. Has anybody run their car with and w/o an aluminum shaft the same day to figure out if there is an et gain? Thanks for the help and I am also wondering about the 52mm throttle body too and what kind of gains to expect. I hate spending money for nothing if you know what I mean