N75J Valve - what actually is it? and should I get one?

[CHRIS555]

As the title suggests? I have a 1.8T Stage one tuned, soon to have a larger turbo fitted. I've heard about a valve replacement part, the N75J? Could anyone tell me a little about it and any pro's and con's please?

Thank you!

 

[docurley]

Do a search theres loads of info on the subject.