"But due to the present regulations the other drivers have better chances again. This brings back the tension"

Jacky Ickx's quote is referring to the policies of a race or competition. He is recommending that the policies have changed in a way that provides the other drivers a benefit, which has actually caused tension to return. This might indicate that the policies have actually been altered to give the other motorists a better opportunity of winning, or that the regulations have been altered to make the competitors harder for the driver who was formerly in the lead. In either case, the policies have actually triggered the stress to return, as the other chauffeurs now have a better chance of winning. This might be a source of disappointment for the driver who was formerly in the lead, as they may feel that their benefit has been eliminated. It might likewise provide excitement for the other motorists, as they now have a much better opportunity of winning. Eventually, the quote is suggesting that the guidelines have changed in such a way that has actually caused the stress to return.