Their exhaust is only J-pipe back so you'll still have the bung on your J-pipe for the wideband. There will be a bung post-cat for your secondary O2 sensor as well.
They do however sell a down pipe which is pretty much the only existing option now and it does have an O2 bung for a wideband. You will gain much more performance and response from the down pipe than you will from an exhaust. Ideally, you'd do both.
Keep in mind, their exhaust also has no flex section and you lose the swivel flange of the stock midpipe, so you are required to install front and rear motor mounts inserts.
