Out of those two, the bora would probably the harder one to find parts for.This would due to the lack of the 4mo versions around the world and therefore low aftermarket performance parts and knowledge. Basic things are fine, but when you start talking gearboxes, rear suspension, engine swaps etc it gets tricky. Most boras are fwd and rarely seriously modified.
The passat 4mo was released around the world, however the v6s are really strung out so any performance work is induction and associated engine rebuild. Haven't seen much engine swaps apart from dropping upgraded 1.8t engines from the golf.
Might not be what you want to hear but an actual r32 would be a better canvas to use.
I love my bora but I bought it with little plans to seriously modify it because the cost would be too high as it'd be completely experimental.
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