I've ridden in and driven a stock suspension sr20-swapped 240, it was just fine. This was even a stock suspension exhibiting some signs of its age. Then again, I've also driven that car with kei office coilovers and sticky tires on some big WRX wheels ( ) and it kicked ass, the stock suspension was so much mushy dog poo dried in the shape of springs and shocks in comparison. That is equally true with the KA and the SR, though.