I bought two of these...

http://cgi.ebay.com/ebaymotors/ws/eB...192454376&rd=1

I offered $105 each and they include shipping, those are usually $114.18 everywhere plus shipping. They are just about the same length as the resonators. What I'm doing is cutting the resonator pipe right behind the first O2 bung, which will require a little grinding because you are just barely into the body of the resonator (the pipe extends inside, just need to grind down to get to it). That piece will be welded to the front of the cat. I'm also cutting right behind the rear O2 (don't need them, pipes have two more for six total) and that piece will be welded to the back of the cat. That makes the cat pipe the same length as the resonator pipe was and it should plug right in. I should have the welded pipes back tomorrow, hopefully they don't f it up....

Are they a sufficient replacement for the 4 factory cats? (or at least the main ones) Keep up updated. Thanks.

Not sure what you mean by sufficient, but they flow a ton more and are supposed to pass emissions so I would guess that covers the bases....

Sounds good. What gaskets and hardware are you using?

For the cats? I welded them into the pipes that came with the longtube system.

Manifold gaskets, etc.

Check the install thread here, will probably answer any questions and includes link to pictures...

https://www.f150online.com/forums/sh...=1#post3065761