i have 4 cats and O2 sensors before and after the cats. I want to put High Flow cats in but i dont know if i need 2 or 4. here is a very basic pic of what i have.




help would be greatly appreciated thanks

 

You can have all four factory cats replaced with two hi-flow converters, Magnaflow ones to be specific.

Your front sensors are up on the downpipes, then the pre-cats are mounted, then the rear converters are there with the O2 sensors mounted in them, I believe thats how the '99 - '03 rear cats are, just like the '06+.

The part #s that will work are #94306, 94006, and 94106.

94306: most commonly used, very clear and sound allowing cat, with a 12" body thats polished T-304 stainless.

94006: same as above except a little nosier and T-409 stainless ( not shiny )

94106: the loudest of the three, its got a 9" body in T-409, and its the loudest giving a near cat-less sound. Most affordable too at only $67 per cat.

 

I like the 94106 hiflow cats cause its cheap and loud but I have another question. I have a the force II flowmaster setup and it comes with the 50 suv series muffler and im looking for a nice loud muffler im probably going to go with the super44 series. should i leave my exhaust cat back dual out and just replace the muffler or should i make it true dual. im really looking to keep the proformance i have and make my truck loud.

 

up

 

Keep it SI/DO. Good choice on the Super 44.

 

thanks for the help. im gonna be buying the cats this monday and ill sell my old ones to a scrap yard or somthing and buy a super 44. thanks again

 

Sounds like a plan, enjoy the sound, and report back to us about your experience. Noone has got hi-flows with a Super 44 muffler yet so you may be the first to report back, and get a video!

 

Darren, will those hi flows mess with the sensors or should everything still be OK

 

haha im about to order my high flows today. then theyll be on with my super44!

im going with the 94306 cats. good choice?

 

As long as the rear O2s are mounted after the new hi-flow cats, everything will be alright.


Awesome man, yes a good choice. They'll never rot out. Any way you could get a before and after video of your truck with good quality? I'm highly interested. If I never hear one my Super 44s are going in mine this April.

 

your setup with super44s would sound sweet i think, but then again it sounds great now

 

Yeah man, i'll try it for kicks. When I bet bored or when I want my econ omy back i'll put my Magnaflows in. & thank you. I'd say the same back but YOU NEED A VID! I'm sure it sounds sweet though.

 

I have the 94306 cat and it sounds good to me, I would also like to see a video with the super44. Try to do a drive by in the video.

 

hey darren before i go buying these cats, are you sure that the magnaflow 94106 cats will fit a 2003 f150.
andy-jr. and darrenws6, both your exhausts sound realy good ill have to post a video when i get every thing setup.

 

my 94306 high flows will be here Monday They will be going on Tuesday or Wednesday