I've been thinking about getting one. Is a diverter valve the same as a dump valve? I was also told by 2 mechanics dump valves are no good for the engine and can cause problems. What you lot think?
True.
read the sticky about dump and diverter valves. They different 
What you think about the Forge 008 then? No go or approved? I just read the sticky quite a good read. They say a must on a mapped engine. Mines not mapped...YET!
No clue pal, aint had a need to look into it yet.
You need an uprated dv before map, cant tell you which one to choose though.