If suspension and raceability are on your list try 8 Associated t-3 or t-4 rear shocks on the maxx. they weigh in less than the stock plastic traxxas shocks and will lower the truck 1/4 inch. into race mode...

Robert K. McCartney

P.S. the t-3 shocks that i use are far smoother than even the powerstroke setup costing 3 times what i spent on shocks...