Setup tips
 

I only have one really good setup tip so far for the X4:

Use softer tires in front.;)

I believe the way ABC numbers their foam tires, the lower the number the softer the tire. I think they go from R4-25 all the way 'till R4-35

Remember, the X4 tires are the SAME as the rear tires of the SP. Front tires for the SP are narrow, so don't get 'em