All i can say on the matter is once upon a time, I went el cheapo, and bought some Yokohama S-Drives for a Mercedez Benz C230 2.5 V6 Sport, with a staggered front and rear (model probably doesn't exist in Blighty) To complement my new purchase, i went out and bought a completely new set of the Yoko's and BIGGEST MISTAKE of my life.. I hated the car, it felt so grindy and noisy, because the tyres were new I thought I had something wrong with my car and not the tyres I'd just spent a tidy sum on... I thought I had a problem with my axel so grindy was the noise.. Anyway cutting a long story short, I had Mercedes change the wheels on the car, to shut me up... Car was 1000x better to drive, actually drove like a Benz for the 1st time in my ownership and the next day I had 4 Continental Sport Contacts 3's on order as a result. I'll never ever buy cheap tyres ever again.. I'll always go with what the manufacturer tests with the car from new.. NEVER AGAIN....
Unfortunately some &^%& rear ended me not long afterwards, and something happened to the steering wheel and alignment that was just never right again. With all my tyre woes prior so the car had to go.