We have an 03 Dakota quad cab with the 4.7 Magnum. The drivers side exhaust manifold has developed another hole in it. Good old JB Weld sealed the original hole for well over a year. Now, she's got another one (or the original "repair") has failed. Has anyone bothered swapping to headers? I figure if I'm gonna go through the hassle of replacement (girlfriend LOVES the truck!) what's the best bang for the buck?