That'* going to be tough on car parts. You need full variable control to really work a manifold. Be prepared to find a local source for a set of brushes. I burn brushes out two or three times a year. And that'* on the high-end units.
The Black & Decker tools are made by dremel, but don't have replacable brushes. Stay away from them except for light work.
The tool you got will be good for sanding and polishing, but not really suited for cutting metals with carbide bits.