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what years had 4" exhaust?

903 Views 10 Replies 9 Participants Last post by  spurrinit
New to cummins and tryin to learn. I have been reading up on exhaust, and I see a lot of people saying that their trucks came stock with 4", and to just remove the cat and muffler, or put in a higher flowing muffler. Mine has 3.5". Theres an all dodge salvage close to my house. What years had 4", and will it work on my truck? If I could get it cheap, would it be worth buying and then modifying? I am not getting radical with this truck. Looking for good mileage and a little moor power. I plan on 4" exhaust, gauges, and a programmer (smarty).

Thanks
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04.5 and up came with stock 4" pipe
 

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Yep mine is an 05 and came with 4 inch :thumbsup:
 

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Discussion Starter · #5 ·
cool, thanks. I guess it would be a strait swap? Is it worth doing if its cheap enough? Or would you just get an aftermarket? Thanks
 

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no it wouldent be a strait swap, i think the downpipes are different, i know from my 04 to my 05 the flange that bolts the the turbo was small on the 04 downpipe
 

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Discussion Starter · #7 ·
Is that the only difference? I could probably cut the flange off of the old exhaust and weld to the 4". Is the turbo in the same exact spot? Thanks
 

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I bought the 4" elbow and clamp from an 04.5-07 truck and bought a turbo back AFE exhaust for an 04.5-07 Cummins. Bolted up with no problems.

Size comparo


 

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Just buy a FBD complete exhaust. I just got my 5'' kit today and put it on already. Man it is AWESOME. Dont waste your money on a factory exhaust.
 

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Just got a 4" mbrp turbo back online for $352.00 brand new. I'd go that route before salvage. Good Luck!
 

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if you can find a 04.5 and newer truck at the salvage yard then get the down pipe and the cast elbow and you will be set.
 
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