[steveproracing]

Yes all b4.1 plastics are compatable with the newer car. Most drivers (even the pros) tend to use the plastic parts as they flex a little more than the carbon parts, so when you hit things with plastic it has a give that takes a bit of the brunt. Def stronger for a young lad learning than the carbon. The b4.2 to my mind doesn't have any real strength upgrades other than titanium turnbuckles. Most upgrades are for track handling.