My personal opinion on both catch cans and intake spray is they dont do much and its a waste of money .
Injectors need to be cleaned , dividers in the head need to be cleaned , intake manifold flaps need to be cleaned , throttle body needs to be cleaned . Spray a can of degreaser/petrol/kero based cleaner isnt going to do much to remove baked on carbon in the intake .
It takes me days to do it properly manually and leaves a polished valve finish equivalent to acid dipping the head . Thats the finish you need to restore back the performance of the car .
Bug_racer supports the rebellion of the euro revolution