yeah maybe it is overkil, guy at an auto shop told me to set pressure regulator on 3 kpa or mpa? whateverer the units are. he said i dont need a return and he knew one of the pumps can push upto 5 kpa or mpa so ill be keeping one as a spare. he also told me one pump new costs $200 i got two for $45

. not too keen on the comment about rally cars being not on full throttle 90% time. i reckon it would be bloody close to 90% and always right on redline. theres no time to back off thats for sure. when you are hitting the brakes youre still reving the car quite high with engine braking aswell. anyway thanks guys for ya 2 cents