[FED 387]

the use of JUST a steel or aluminum driveshaft alone is not going to give you any significant reduction in ET--- however when used in conjunction with many other "performance/lightweight" parts the overall performance of a particular vehicle should improve. It all depends on the parts selected and the individual vehicle-- some will see improvements while others may maintain the status quo or its even possible that your performance "may" not be as good as before---- it also might just contribute to parts longevity.--there is no firm answer to this question--- in some instances steel is the way to go while in other situations an aluminum driveshaft is the answer--you just have to experiment and observe what a " quick" similar classed vehicle is using and how your performance compares to that one--- FED 387