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Arnesto 09-05-2013 09:02 PM

Stock 07 Exhaust
Hey there,

I did a search and couldn't find the answer to my question, also a google search couldn't really help either to what I think is a pretty simple question..

I have an 07 1500 Sport. I want to put in a flowmaster 40, but I see ones with dual in single out, single in single out... I know it's 3" in diameter. My question is does it matter if I buy a dual in, single in, etc.? What is the stock in/out on an 07?

RogerRamJet 09-05-2013 11:23 PM

Can you look up under your truck and see what you have?

I deleted my Y pipe and got a DI/DO.

compressor man 09-08-2013 09:12 AM

The inlet to the muffler is 3" and the outlet is 3", if you are keeping it stock and just replacing the muffler you need 3"SI/3"SO. Now if you buy a muffler that can be reversed, you can cut out your Y pipe and run 2.25"DI/3"SO, that will eliminate the restrictive Y and run the mid pipes straight to the muffler so the muffler becomes the Y pipe. I you want loud and cheap, I removed the muffler and ran just the rear resonator on my 07 for a short while, it sounded pretty good but was quite loud.

06 BigHorn 09-08-2013 10:13 AM

I did a single in/Dual out on my old 06




Arnesto 09-09-2013 10:49 PM

Thank you all! Big help. I looked underneath it is single in single out, center on both. Thanks again!

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