I ve got a faulty n75 and i ve came to this conclusion after swapping them and power is back to normal now.
Looking on the internet I saw people Who upgraded their n75 valve ....let s say in my case instead of buying the stock one for pd100 to buy one for pd115 or pd130.
Whould that optimise/improve or should I stick to the stock one ?

Also if my n75 s are faulty shoul I change the map sensor as well or not?

Thanks