The main reason to get a front bar in place is to help stop the weight transfer that reduces your corner speed.
On the Polo (and the majority of FWD cars), a huge percentage of the weight is in front of the front axle (have a look next time you have a front wheel off, your wheel centre line & the centre line of the engine / transmission).
When you hook into a corner, the weight transfers to the outside front wheel, and unloads the inside rear wheel (There are many pictures of Polo's & Golf's carrying the inside rear wheel). If you ever get to look at shock data & weight loads from a FWD car, reducing that transfer makes a faster car - Ideally if you could keep the load very neutral front to rear in cornering, that would be perfect (like a mid engined Cayman).
Making the rear end "stiff" or "loose" doesn't do anything for corner speed, it might feel like you can tip it in better (feel less understeer) - let the FWD pull you through the corner as FWD's do best.
Watch some of the footage of the BTCC, I have seen the suspension setup in those things, and the bias is certainly not towards a stiff rear end
my 2c anyway.
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