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 ...

Back when this '99 Trans Am was nearly new, the original owner installed a set of mid-length headers that served the Bird well, but the time has come for a change. There is a small hole in one of the ...

When utilizing long-tube headers, the oxygen sensor is moved farther away from the exhaust port of the cylinder head. This can cause driveability problems in some applications. If your sensors are ...