As a matter of fact. . . . a flipped lid on a '90 Caprice, with a 350cid, does make an extremely satisfying howl/moan. Doesn't do squat for performance. In '91 they put the LT-1 motor in the Caprice. It'd run like a scalded ass ape; second gear scratch. But, you had better have a long distance to stop it; 205' to stop from 70mph.