As far as I know, the original car was designed for the Italy world's track (very bumpy & low grip). The original BX was awesome at Tiverton - the nearest the UK had to a hard-packed dusty track.
A popular modification in the UK is to run slightly longer rear shock shafts and a Paul "Bradby" rear shock tower. This raises the rear tower up, giving the same overall droop but more jounce (wheel up travel) for bumpy tracks / big landings etc. This was used everywhere on all kinds of surfaces.
The Factory kit comes with slightly longer shock shafts in the box, I'm not sure if it has a different tower or not.
The other thing we found in the UK was that out of the box the BX had huge amounts of front end grip compared to the rear on grass/ high grip tracks. The rear end can't match the front for grip and the car had instant 180 degree oversteer. I believe this is how the rear upside turnbuckle mod came about to alter the roll centre.
If I've got any of this wrong, I'm sure someone will correct me.
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