Ditch the stock 2speed and pinions for the LW .8 module 2speed (comes with pinions) and get both LW shafts. That will take a bit off the car and you will definately notice speed.
Hmm...been wondering if I should've just gotten a bunch of LW and spare parts for the R40 instead of the 8th onroad since I've found a few real cars I'm lookin at. HMm.....nah.