In Italy only S001 is available and not S04PP. My car has and ECU mapping and a TarOx B33 10 pots calipers and 335mm discs system on front and 315mm discs on rear. With Carbon Lorraine RC8 pads on front and RC6 on rear. With such a braking setup and 175Bhp under the bonnet with loads of torque, it is easy to detect tires' performances on such a light car. Former tires were the Pirelli PZero Rosso, always 225/40 ZR 18 92Y XL. Pressure was 2.5bar front and 2.4 rear for both brands. The PZero ended their bed in period after 2000km and the Bridgestone are still to bed in at the rear. Makes sense given the higher treadwear index of Bridge tires.
Performancewise the Rosso proved to be quite more responsive, requiring noticeably less steering angles at same reference turning angles, hugely more responsive in slow speed (less than 50km/h) turnings and slalom like turnings. I can witness more braking performance on Rosso when dry: they keep the grip even from 180km/h to nil, while S001 are till now worse performers.
Where S001 excel is on wet roads.Very good acquaplaning performances, very good cornering. Braking on wet is another story, but it is common to many max performance asymmetrical tyres, and must be considered the fairly aggressive braking system my car is equipped with as well. In the end S001 COULD potentially be quite top notch tires but they suffer from heavy understeer: initially they quickly respond to driver's input, yet quickly going into understeer mode. Till now nearly always I had to correct steering angle at 1/3 of the curve being careful not to lift right foot at the same time to avoid unwilled understeer to oversteer transitions. Ultimate grip when cornered is impressive and superior to PZero Rosso, yet shoulders should definitely be stiffed for confidence inspiring crisp turning.
Will see if mileage will improve their score.