not saying the manifolds flow as well as the headers,or even make as much power. but,alot of folks DO have those problems. snag them on speed bumps,have leaks over time,etc. on the same side of that coin,most run stock starters(and constantly cook them)run poor gaskets (that soon leak)and get tired of the tight fit. my standpoint on headers,is,majority of folks car will see little,or no track time. much less rarely ever run for over a few seconds above 4000 rpm. with those factors, huge pipes,and headers are going to produce very little "seat off the pants" feel. cruising around the dairy queen,you won't be able to tell the difference.