I want to put Magnaflow High-Flow Cats on my 5.4L. How much would the install be?

How much hp would i gain from these cats and the efans from Mike Troyer?

Thanks.
Jon


P.S I also have a superchip

 

jon - for money versus hp, you have nothing to gain, i tested oem cats on my 03 5.4, at 5200 rpms under load- i measured backpressure behind 2nd cat on each side- it was 1.25 psi per side- that is next to nothing- if ya wanted hp- it would be at a cost-long tube headers , magnaflow cats, true duals and x-pipe-phil