hey snaut, if your bashing the 8 copper springs will be ok, your truck will be very bouncy and want to flip when turning alot, if u want it to not bottom out then thicker oil is the choice, if your racing, forget about the copper springs, 8 of them and u will be flipping and tumbling and bouncing all over the track, best setup for racing is all red springs, i found for light bashing that 1 blue and 1 copper on each corner worked well, even when WOTing of my ramp
