hey,

i'm thinking about putting a complete exhaust system on my 07 fx4 5.4. any suggestions what i should use? looking for low end power.replacing: headers, high flow cats, x pipe, mufflers. i live in cali so it needs to be legal here. any help appreciated!

 

Since your in cali, dont waste your money on shorties. High flow cats will not be legal. Your pretty much stuck running a true dual system, without touching the cats or headers. Use 2.25" pipe, and i would suggest magnapacks for mufflers (2.25") X pipe, and exit out the back behind each tire at a 45 degree angle with 4" tips.
.

 

Only use 2.25" pipes if you can get the pipes mandrel bent. 2.5" if you can't.

 

thanks for the input. jba makes 50 state legal headers. i'm just wondering if they are worth the hassle for performance. nobody makes a c.a.r.b. numbered cat...bummer!

 

The JBA's are more or less useless in terms of performance. Not worth the effort to install them IMO.

 

if they are shorty headers, they are not worth the money and effort to install.

 

no shorties, if you want low end power true duals 2.25 inch in diameter with an H-pipe

 

i personally enjoy the "search" feature :P

 

HA.

 

Fixed that for you!

 

Cali = leave manifolds & cats alone, run a cat-back for no hassel. True duals may get hassle from the inspection station even.