Open headers

[Garrett114]

I have a 04 cobra race car with a 3.4 whipple making 22# of boost is open headers best for a race car are do mod motors need back pressure I really don't mind the tractor sound just looking for HP I'm running kooks 1 7/8 to 1 3/4 headers

 

[Termilvr]

intersted as well, i have been toying around with the idea of getting turndowns for my longubes for when i want to make some real noise but wont do it if it will have a negative effect or if i will have to get a specific tune the setup. only if i had cams.......

 

[Garrett114]

Any body with some experience