im sure this has been debated before on here many times! my question is im looking to install headers on my 04 f150 5.4 3v 4x4. i have the banks 3 inch catback,spectre intake,t.b. spacer, and the edge programmer. all thats left is the headers. its my daily driver and i do some dunning and towing. i want to keep it reliable so most likely it will stay natural asp. does anyone know of a system that has a cat delete? and is there a difference with or without cats? thanks

 

you said reliable and throttle body spacer in the same post


you ought to get a custom tune before you go any further


if you don't have cats you violate federal law

 

oops..yea its up and go every day and i really dont want to be stuck in the driveway cranking and cranking the engine?!?!?!?

 

?????

 

what do you recommend?

 

First ditch the spacer and use it a paper weight or door stop its not gaining you any thing. I would leave the cats alone as it is illegal to remove them and they really dont cause to much of a problem and the headers will help the truck breath better.

 

ive been reading up on the dynatech and obx

 

x2

 

You really cant go wrong with either of those choices.

 

thanks..but they both offer off road versions(catless) eventually when i hit the lotto it will be a dune shredder!...i believe they have o2 bungs welded in? do i have to worry about any check engine lights?

 

Are you talking about running with out the O2 sensors? Because if you are you will have problems because the PCM will not know how to adjust the fuel mixture with out them and yes you will get a CEL.

 

yes they have the bungs welded in...

 

Leave the cats alone? With long tube headers?! Jesus people, do we really want to see this guy come here telling us how his cats welded themselves solid? It would be extremely funny, but I'm sure he wouldn't enjoy it too much.

If you enjoy having a working truck with LT's, you have to have either hi-flow cats, or no cats.

 

thanks..im ordering the obx lt's

 

i would order a custom tune when you install the headers, or youll be a lean mean running machine.