Need help w/ Magnaflow Catalytic Converter for 99 2 door

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

no cigar

Member
Joined
Aug 14, 2011
Posts
98
Reaction score
9
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

Full Access Member
Joined
Dec 21, 2016
Posts
1,555
Reaction score
1,379
Location
Mississippi
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.


Sent from my iPhone using Tapatalk
 

no cigar

Member
Joined
Aug 14, 2011
Posts
98
Reaction score
9
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

Full Access Member
Joined
Dec 21, 2016
Posts
1,555
Reaction score
1,379
Location
Mississippi
Is it a California vehicle (RPO code NC1)?

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

40bac9ea74537d22f186d55b9ed458bb.jpg






2130e2bf436aef914deeba60d2c3f33c.jpg
 

no cigar

Member
Joined
Aug 14, 2011
Posts
98
Reaction score
9
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

pFJxRVJ.jpg
 

no cigar

Member
Joined
Aug 14, 2011
Posts
98
Reaction score
9
I'd assume adding a cat back as well would be in order to use the dual-in midpipe?
 

east302

Full Access Member
Joined
Dec 21, 2016
Posts
1,555
Reaction score
1,379
Location
Mississippi
I bought this to put on my son’s truck, but the 49-state versions do have the two coming into the flange.

5c79409ae16cc51c99a208a8672f6e6a.jpg


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.


Sent from my iPhone using Tapatalk
 

no cigar

Member
Joined
Aug 14, 2011
Posts
98
Reaction score
9
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

Full Access Member
Joined
Jan 31, 2017
Posts
1,471
Reaction score
2,006
Location
Largo, FL
Have you considered just taking it to an exhaust shop and having them make you a system?
 

Forum statistics

Threads
128,786
Posts
1,805,372
Members
91,765
Latest member
AT4Hunter

Latest posts

Top