How much horsepower do headers add?

I currently drive a 2021 Dodge Challenger Hellcat and I want to switch out the exhaust manifold for a header to get more horsepower, but I don’t know if it’s actually worth the trouble and cost. How much horsepower do headers actually add?

Megan Lebron · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Switching out your traditional exhaust manifold for a header on your
will give you a horsepower boost, but exactly how much will depend on the type of header you install.
Headers have two basic varieties – long tube and short tube. We’ve broken down some of the major differences below.
Long tube
  • Pros: Maximum HP boost, most efficient at reducing engine pressure
  • Cons: Bulky, won’t fit most cars
  • HP boost: 6-9 HP
Short tube
  • Pros: Fits most cars, easier to install
  • Cons: Not as efficient at reducing engine pressure
  • HP boost: 3 HP
You can always chat with a trusted mechanic to get their opinion on which type of header they would be able to install in your vehicle and get a cost estimate before making a decision.
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