They help the engine "breath" better.
10 to 20 percent
Headers may add 3-5 hp depending on design and a cold air intake will add around 4-7 hp for a total gain of 7-12 hp untuned. Definitely worth it especially with the nice throaty sound you will get out of it.
Headers can add approximately 10 to 20 horsepower to a 454 engine, depending on various factors such as the design of the headers, the engine's overall condition, and supporting modifications like carburetors and exhaust systems. Properly tuned headers improve exhaust flow and reduce back pressure, which enhances engine performance. However, the actual horsepower gain can vary based on the specific setup and tuning of the engine.
240-260 horse power stock, supercharged. Buy a smaller pulley for supercharger add 30-60 horse power more.
To modify headers in Mozilla Firefox, you can use the "Modify Headers" add-on. First, install the add-on from the Firefox Add-ons site. Once installed, access the add-on through the menu, enable it, and then you can add, modify, or delete headers as needed. Remember to disable the add-on when you no longer need to modify headers, to avoid unintended changes to your browsing experience.
about 100 horse.
if you can find the hp. of the eng., you can add between 12-20 more hp. for the headers.
a cheap way to add a couple horse is to add a later style escort intake to yours, say a 96-99 if the bolt patter is the same
Start with a cold air intake, then add headers. If you want 100 or more horsepower instantly add nitrous
Clean out the carb and add a high flow air filter
yes
It depends on if you are going with shorties, long ones, equal length, or non equal length. It will really only add 1-10 horsepower depending on the header and exhaust system.