rob: there's tons of info on undertails on the site.. if you want it to look more like stock without the welding mask on the back, try cutting your undertail down with a dremmel.. you could even get rid of the stock turn signals and get some flush mounts or shorter stocks. before i put my undertail on, i did like a lot of guys do and just chopped the heck out of the stock tail, trimming it way up to just below the license plate bracket..
or, you could do a search as i said, and find tons of pics of undertails on the site. i put on a tail from extreme graphics, which a lot of guys have done.. i think it looks great and you can order them in a configuration which allows you to keep the stock tail light..
hope this helps.