When you fit a power steering cooler, does it affect the steering feel on normal driving? Does it make it any heavier or slower reacting, etc?
No difference at all. It's fitted to the low pressure side. It's to stop your fluid overheating when drifting, if you not got that problem you don't need it.
Sorry for the stupid question mate but as I'm not looking at the car at the mo, how do I identify the low pressure side?