I wondered if someone can give me any advice on this. They aren't a valves I'm really knowledgeable about but I've been told if you fit the correct one gains can be found. I've just been offered a ECS N75 Race Valve and wondered if they are worth the swap. I currently have the later variant which I think is an E. Prior to this I think I had the F variant but this was shot hence the change to the later spec one. Thoughts and opinions please guys.