I was perusing a Toyota Tacoma site and noticed that some guys upgraded their 4-Cyl by purchasing after-market exhaust headers (HERE) . They claim to get more power and better mpg.
So, other than the obvious issue of $450, I am wondering why these wouldn't be standard equipment, or at least optional? I know there is a downside (reduced filtration) to putting on a K&N racing filter on the intake side, but is there any cost (other than dollars) to putting headers on the exhaust side?
Auto manufacturers seem to go to great lengths to increase their CAFE mileage. Why not use headers?
So, other than the obvious issue of $450, I am wondering why these wouldn't be standard equipment, or at least optional? I know there is a downside (reduced filtration) to putting on a K&N racing filter on the intake side, but is there any cost (other than dollars) to putting headers on the exhaust side?
Auto manufacturers seem to go to great lengths to increase their CAFE mileage. Why not use headers?