Super Six install on 1974 Dart

kesteb said
The SuperSix engines didn't use a 2 1/4" exhaust system. The exhaust manifold outlets were roughly 1 7/8" in size, the same as all the others. The outlets also have a roughly 5* tilt to the rear. This may have more to do with exhaust routing to catalytic converters then any performance benefits.

The best bang for the buck, is installing a 2 1/2" exhaust system. This will wake the engine up, as it allows it to breath.

That's not entirely true. The big exhaust did come on "some" but not all. I don't know what rhyme or reason was used to determine it, OR if it was even on purpose, but I have seen at least two stock, unmodified slant 6 exhaust manifolds with large outlets in the 2.25" range. I know there were more, because I've seen others post about it here.