My 240sx has a small vacuum leak that keeps it from idling properly. I need to remove the intake manifold and beef up the gasket that is in there. But, rather then do that I spent my Saturday painting my exhaust pipe and hood argyle. I haven't noticed any significant gains in horsepower yet and the idle is still barely happening, but, I think the argyle has made things better.
(I'm sorry to any of my guests that tuned in to discover the claimed "healing power of argyle". It has no true healing powers. Unless making things sexy is a healing power? (It is.))