brittle plastics can be solved by boiling.
Mugen MBX6 has plastic issues as well.
D8 plastics are quite good.
D8 that won worlds champs and FEMCA is a different car - all the parts are lightened :)
RC8 driven by Maifield and cavaliery has ton of titles :)
But in case of these guys it does not really mater what car they run as they would win with a bucket on wheels
4100g buggy? thats crazy. My truggy is 4250g
My nitro D8 started over 3700g now it is under 3500g, but for example lightened MBX6 is under 3300g
Lighter car = better acceleration, braking
No car is perfect :) except my hoped-up MBX5-T
//edit: i like my D8 it is very easy to work on, it's tough and handles ok. Just need to make it bit lighter.