So I am beyond frustrated with my truck right now. I have a 99 f150 4.2. I am replacing the pre-cats being as my driver side one is blown out. I bought the magnaflow replacement one and was very disappointed to find out it doesn't even have the correct angle on it. I rigged it up anyway with some different bends and cuts. I got it all up there and now it's leaking at the front of the cat. Is the pipe coming off the manifold 2 1/4 or 2 1/2? I wasn't able to disconnect the exhaust from the manifold because the bolts were stuck and I didn't want to snap them. Any help would be appreciated wether its how to get those bolts out without snapping them, what size that pipe is, etc. I'm also considering just running a 45 degree angle and buying some straight cats because that magnaflow is a pain. Opinions? Also any help on getting the rear O2 sensors out? Thanks in advance.

 

Nobody has any advice???

 

Hick, where do you live. I live in MS and I deleted all four of my cats. Went to a small town muffler shop and was charged 40.00. They will do pretty cheap because the old cats can be taken to scrap dealer for money. Just my .02 worth. Truck runs better and sounds better.

 

...

 

I live in central Illinois. They won't do that here but I'm pretty knowledgable and have access to a welder. I did delete the rear 2 while i was working on it. Do you have check engine light on? If not how did you eliminate it? I was gonna do the gotts o2 mod (drilled out spark plug non-foulers) but as hard as I've tried I can't get the o2 sensors out.

 

When you say "delete" you mean cut out right?

 

Ya I cut them off and welded in a piece of pipe in the place

 

I have only the precats left i wouldnt go as far to cut them out too then itll sound horrible but very loud

 

I've actually read the precats don't really affect the noise.

 

They have too cause my truck would pop more without it and be way louder