I bought my first set of TAs used , I am now on my 3rd set (2 sets new) over many years, I have plates for W2 heads (on car now) and standard heads, I like them and haven`t had any problems and have a flange to hook up mufflers/exhaust. Be sure and study the installation diagram as if you don`t follow it they don`t go in. Ask me how I know! after many years I finally have the tube installation order memorized.