3.8 headers Reply #15 – December 02, 2010, 01:41:08 PM MACs tend to warp because they don't have a that ties the tubes together. Quote Selected
3.8 headers Reply #16 – December 03, 2010, 09:21:01 PM well neither do the other ones except at the ports, in which case the heads/bolts hold them in place.... Quote Selected