Compression Ignition Addict
Join Date: Jul 2010
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Well there are 4 different 5" to 4" reducers.
5" id to 4" id
5" id to 4" od
5" od to 4" od
5" od to 4" id
(id= inside diameter. Od= outside diameter)
First you need to measure your 5" where u will be connecting the reducer. It should be 5" from the outside to outside or inside to inside. If its a id then the 5" side of the reducer needs to be od. If the 5" is a od then your reducer needs to be a id. Once ya find that out ya need to do the same for the 4". If the 4" is id then it needs to be od on the 4" side of reducer. If its od then u need id.
It all depends whether the exhaust is bumped up for another pipe to slide in. Napa should be able to get it but it's prolly something they are gonna have to order. Better chance or stopping at a local big rig shop.
2010 F350 6.4-
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