I have a 04 5.4 with a bullet and an exhaust cut out. I want a louder, deeper, more rumbly tone. I've been reading around the forums and I've decided replacing my cats is the best idea. The only problem is that there's different ways in doing this. I've read about replacing all 4 cats with 2 hi flow cats, leaving the pre cats and deleting the rear cats, and vise versa... I've read many contradicting threads and pretty much all I want to know is,

Which cats should I keep? Which cats should I delete? And with which cats should I replace them with so that I get a good sound, pass emissions, and get no CEL?

 

I'm looking to do the same thing but keep the front two and get rid of the rear two. Ive read that getting rid of the rears will be okay and wont have the cel light come on.

 

^ right

 

Chop the rear cats and those Bullets WILL be heard far.

http://www.youtube.com/watch?v=Vi-L12mt5E4

 

Man I can never beat AV or Darren to the exhaust questions! haha what they said....

 

I have all 4 deleted and I wish I would have left the front 2 in cause I'm having trouble finding a muffler that's still real loud that doesnt have a high pitched snap

 

Did you install an X or an H pipe? That will help with the popping..

 

are you guys using the universal cats for the front, or the vehicle specific ones? I'd rather buy a 70 dollar converter than a 250 dollar one if I can

 

Allied.....I would try something in the 30" length

 

I have an x pipe and this will prob sound weird lol but my high pitched snapping got worse when I installed the x pipe

 

What x pipe did you use? A home made job? The chambered style x pipes are the way to go. I have the magnaflow one.

 

It's an actual x pipe From a muffler shop

 

Mine doesn't have a high pitched snap. What mufflers have you tried?

 

I have a dynomax di/do I think I'm just gonna fork out the for the borla's out of all the set ups similar to mine yours is by far my fav avfrog

 

Fork out the cash lol