If you own a Jeep with a 4.0L engine, chances are pretty good that you either have, or will have, a cracked exhaust manifold. Oft-cited causes range from bad motor mounts to poor factoryprocesses.

The unfortunate reality is that race cars seldom enjoy retirement. If they aren't destroyed in a crash and hauled off for scrap, most wind up parted out. It's a hard life, no doubt about it.

Just how much power can Supersprint exhaust headers add to an S54-powered BMW Z3M Coupe? In this video, we install a full header system and head straight to the dyno to find out. 🎧 Plus: hear that ...