Ok, so I am very brand new to this Forum. I am having a issue with my "V" and not knowing where to start. I have this rattle that I get at idle and also under a load at acceleration. I have asked a tech and said it sounds like valve ping, because I have been running regular because I was told my another "V" owner I could do so. But the rattle I got before. I do have a corsa exhaust and have heard of the resinator going bad as well. I drove in 3 gear and a high rpm and kept acclerating and trying to find the noise, it sounds like it is coming out from near the middle of the car toward the drivers door. First what grade fuel can and should I run in here? And second what or where should I start?