I have a stock 2007 Camry LE I-4 and I was wondering if there is any way for me to make the steering heavier? (i.e. reduce the amount of boost from the power steering)

 

The PS pump contains spring loaded pressure relief valve. Reducing the spring pressure would cause the pump to bypass more fluid and reduce line pressure. This could increase the steering wheel force required.

If this would work in practice, do not know.