[DCastaneda]

Diffusers in the traditional sense may have negligible effect on our little cars but some slightly unorthodox diffuser designs will create a significant difference. You're basically trying to make a relatively flat front end and streamlined rear. A teardrop shape or airfoil of sorts but for ground effect. That combined with some vertical stabs and you're set. This is all very unnecessary to only hit 100mph but to go beyond this point they may be needed or atleast aid in maximizing speed with the power available.