How much horsepower do headers add to your V6 mustang?

The answer to this question depends on a variety of circumstances:

1. What size is the engine? Larger engines benefit more greatly from increased exhaust flow in most cases.

2. What size headers are you thinking of using? Choosing a primary diameter that is too large or too small may reduce your total power.

3. Headers alone may not have much effect on power if the engine already has a decent set of exhaust manifolds and/or has a restricted intake system.