Well, I am up in the air on those. I have straight pipes right now and I am trying to create a little bit of low end power with the shorties, so I am not sure if it will help my low end or top end power with the high flows.
If you are looking to save money get a pair of SRT-8 take off's quality will be much better, I asked the same question a few months ago and did some research and didn't find very good results.
Check the flange thicknesses of the Headmans compared to other headers. A buddy of mine had Headmans on his truck which has a rather thin gauge flange and constantly blew gaskets. You do NOT want to be constantly taking your headers on and off. The install is a PITA...
'06 RT Charger - Black Crystal Pearl
Mods: FRI Sidewinder Cam (!!), 6.1L springs, 6.1L rods, Diablo Predator w/ Custom B&G Tune, Kooks LT Headers & Hi-Flow Cats, Flowmaster Catback, RamAir Hood (Style I), AFE Stage II CAI, SRT Struts / Springs, 170* T-stat, Coolit Fan Mod, NoESP, BT Catch Can, Daytona Wheels, Daytona Hex Grill, Rear Spoiler, Nav In-Motion Disable