Tubular manifolds do look much sexier, but I am willing to trade functionality for some looks. I track my car ofter so I wanted a manifold that I could withstand the beatings that may be dished out with no possibility of problem occuring. A properly made cast manifold will also support 95% of most peoples horsepower goals.
If you want a pretty manifold, get a stainless tubular
If you want a manifold that you will never have to worry about cracking or anything, get a cast Ni-Resist
