It will be loud with only the fentons on and no pipes. Recommend that you go to pepboys or similar and get some short pipes with a flange. cut them as necessary add some flex pipes to each with whatever mufflers you will be using. Bolt them up in the front and wire them up in the rear and then drive down. Depending upon how you have your oil filter set-up you may scorch that also without pipes of some type. You'll need pipes on it anyway to get it tuned-up before it goes to the muffler shop.
