Need help w/ Magnaflow Catalytic Converter for 99 2 door

[no cigar]

Hey guys. Apologies for bumping an old thread. I'm replacing the midpipe/cats on my 2 door sometime soon. I got under the truck and noticed that I had a single input muffler and Christ, the MF 93603 is ridiculously expensive! Even Amazon is saying over $900. It seems like I saw it just a month ago and it was around $600-700, still considerably more than the dual inlet version. What gives?

How hard would it be to just swap over to a dual inlet muffler?

 

[east302]

What year model is this on? Later ones (and I’ll say 96 and up) would have used a two-in single out muffler stock with two catalytic converters.


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[no cigar]

Mine is actually a 99 leftover. The more I look into it, the more I’m finding out my application is probably stock not for my truck (is for the 4-door) and was changed at some point by a previous owner.

 

[east302]

Is it a California vehicle (RPO code NC1)?

Parts diagrams show those using a single-in muffler on the two-door.

 

[no cigar]

Is it a California vehicle (RPO code NC1)?

Parts diagrams show those using a single-in muffler on the two-door.

Oh wow, thanks! I had no idea. I did observe that RPO on the inside tag had NC1

 

[no cigar]

I'd assume adding a cat back as well would be in order to use the dual-in midpipe?

 

[east302]

I bought this to put on my son’s truck, but the 49-state versions do have the two coming into the flange.




I would assume that the y-pipe connection to the manifolds is the same spacing across CARB certified and 49-state, but wonder if there was a difference in the catalyst itself.

There probably was.

If you’re still in California, it might matter for emissions testing. If not, then I’d wager that you could swap the entire thing out from manifold back. I’d compare the oxygen sensor locations and part numbers just in case.


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[no cigar]

The funny thing is I'm in Texas. I bought the truck here as well back in 2009. I think I'll begin the process of swapping the catback as well.

 

[bigfootchiro]

Have you considered just taking it to an exhaust shop and having them make you a system?