What length do i order if i have an 04 and i qant the 94106?

and does any know the length i should get for a dynomax race bullet?

 

Length cat? The 94106 is a 9" cat if thats what your asking.

As for the muffler, smaller = louder, longer = calmer. The small bullet is 10"s I think, and the longer one is 16"

 

im looking to install 2 94106 myself, am i gonna need to repipe or can i just cut out and install?

 

Since you have an 04 which has a 4 cat setup, its best to leave it to the exhaust shop. The pre-converters are at a angle, the manifold downpipes come down to them, then **** out straight and run to the rear cats with the rear sensor mounted between the two. There will be welding and pipe bending involved.

If cost is an issue to you, and you do not have emissions, and your friends with your inspector, I would just remove your rear converters like I did, volumes it up equal to/or better, than hi-flow cats will, and keeps the CEL off because it burns the exhaust gases properly.

Heres my thread about my removal of the rear cats, a fun DIY modification.

https://www.f150online.com/forums/ex...rear-cats.html

 

i only saw two cats what do the pre cats look like

 

ok darren i went and took a pic and used paint to show you some stuff:

http://i454.photobucket.com/albums/q...let32/cats.jpg

 

I dont have a clear photo of them, if you would like I can run out and take a picture of mine in a few minutes, look at the last photo on my removed rear cats thread you wee about 3/4 of the pre-cats, or crawl under your truck and check them out.

 

yea man youve got 4 cats unless some one hacked off the rear cats before you got the truck if you got it used,