Yes and my advice is to not waste your time. Tried them about 5 years ago and car went from 10.80's to 11.23 and blew the dipstick out from all the back pressure, took them out and went right back to normal. Have heard good things about the dynatech cone type inserts though.
Both my Novas just have cheapy Dynomax bullets on them, they dont take up much space and I like the sound of them. $30 a piece is good too...lol