I've worked out that my N75 valve is faulty, so I'm looking for a replacement. Has anyone had any experience of either valve on their car? Seems that the "H" version is the same valve the ECS sell as the "race valve". The "J" version is apparently less agressive. I'm thinking about the "H" version as my AGU doesn't have a MAP sensor in the intercooler and would be less likely to go limp (ooer :0)). Thanks.