Team XRAY is trying to stay ahead of the competition, they have released a New Aluminum Chassis for the T4 platform. The chassis is 2mm narrower which will increase steering and stability. The new chassis was designed with medium & high traction carpet tracks in mind.
Look for a Feb 4, 2014 release. Part# 301136. Fits only T4’14
More details at XRAY T4’14 Alu Chassis 2.0mm – Swiss 7075 T6