It’s a time-honored tradition for late-model Mustangs. Upgrading to a performance exhaust system not only improves horsepower, it also adds that Mustang-specific exhaust tone that has been so popular ...

Previous tests have shown unequal-length short-tube headers are worth around 7 hp on a near-stock 5.0 engine, while equal-length short-tubes typically pick up around 11 hp. Frankly, we were amazed at ...