headers or not to headers

Last Mopar car show I went to I wondered why non of the A-Bodies had headers on them. After installing a set of cheapy Flowtechs on my 318 Dart Sport, I now know why (all the reasons stated above). A lot of people praise the TTI's, however paying $600 for 10-20 horsepower is not cost effective. For a cost of TTI's I'd rather run stock exhaust manifolds with duals and spend that money on a nitrous kit.