It could result in a eml but sometimes it doesn't. Both times I have used hfc's I haven't had an eml. However some people do get them, you can but spacers for the sensors which can help.
More than likely. We've often seen new owners on our stands at shows with 370Z Nismo's and asked them if they still have them in, especially if they look a little tall so to speak... ๐
I used to have 1 on my old 370Z which I loved also. It's a great exhaust. I put high flow cats on it as well and it really brought it to life when under acceleration. She sounded lovely. There was no noticeable additional drone either. but as I said sounded lovely when you wanted it to.
He was probably doing it about you to the others also ๐ I do warn some of my nicer neighbours when leaving early in my Zed, but the others can do 1 ๐๐