It's a story as old as hot rodding itself. It starts with the sales pitch-"Buy my widget and your engine will gain 50 hp"-and ends with a disappointed customer with a car that sure doesn't feel like ...

Lucky us! We happened to get our paws on a crate Hemi-and the green light to run it to within an inch of its life on the dyno. Even better, we had a chance to bolt on a selection of go-fast goodies to ...