I had a Dodge Ram 5.7 Hemi, with a cold air intake on it. It was not an AFE, but it was an alluminum tube with a Amsoil filter on the end. It sounded great on the Hemi, and it was not too loud pulling my boat, or just driving around. I also have an Injen w/Amsoil air filter cai on my 06 Eclipse, and to be honest, it has been on their so long, and with the exhaust also I really couldn't tell you how it makes it sound. I just can't remember what it sounded like stock. Anyhow, my used oil analysis does not show anything wrong with my air filtration in the oil. Also, by Injens dyno sheets, and real world sheets, there is a a hp increase, and it is not only at wot. Every vehicle is a little different.