We recommend using larger-diameter holes on low-traction tracks, and smaller-diameter holes on on high-traction tracks. Larger-diameter holes allow for more roll and decrease car responiveness, making the car easier to handle. Smaller-diameter holes allow for less roll and increased car responsiveness.
The new pistons have a larger external diameter and are flatter than the standard kit pistons and because of that, these pistons fits only to 308306 alu shocks specially developed for T2 008 cars.