The XB8 chassis had been redesigned to fit both SMOOTH and HARD composite radio boxes without chassis modification. The leading and rear downstop screw areas had been redesigned and repositioned for improved suspension system down travel and increased reliability. The engine ended up being relocated more rearwards. The chassis is CNC-machined from 3mm high-quality Swiss 7075 T6 aluminum; strategically machined in low-stress areas and then anodized making it because light as you can without impacting power or rigidity.