I have been running an aluminium chassis in my cougar. I made it myself from 6082 grade ali, its 2.5mm thick and the same shape as the standard CF chassis. The main features being, it weighs 75g heavier than the CF one and the weight is obviously as low as it can be. It still has some flex but it is quite stiff, in high grip it is very good, not run in low traction conditions yet. The cougar definately feels planted and seems to jump in a more stable way. I did have to increase the damping as it was bottoming out over bumps. I'll post some pics later if my camera is charged.
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