Magnaflow muffler install
#1
Magnaflow muffler install
I just received a Magnaflow muffler that I want to install in place of my stock muffler. The Magnaflow has a 4" outside diameter at one end and a 4" inside diameter at the other end. What do I need to complete the install? I believe the stock exhaust is a 4" before the muffler to a 3 1/2" after the muffler. Are these #'s inside or outside diameters?
#4
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My 99 2500 was something like this:
Downpipe 3" -> 3" pipe -> 3" IN resonator 4" OUT -> 4" connector -> 4" IN muffler 3" OUT -> 3" over axel -> 3" tailpipe -> 4" tip.
If you're keeping the resonator, you'd need a 4" to 3" reducer on the Magnaflow output side. I'm no good trying to figure out which is the OD/ID on pipe, it's amazing that I have my stack on my truck right side up.
brandon.
Downpipe 3" -> 3" pipe -> 3" IN resonator 4" OUT -> 4" connector -> 4" IN muffler 3" OUT -> 3" over axel -> 3" tailpipe -> 4" tip.
If you're keeping the resonator, you'd need a 4" to 3" reducer on the Magnaflow output side. I'm no good trying to figure out which is the OD/ID on pipe, it's amazing that I have my stack on my truck right side up.
![Crazy!](https://www.dieseltruckresource.com/forums/images/smilies/crazy.gif)
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brandon.
#5
Joefarmer, that sounds about right from the measurments I took this morning. Anybody know if these are inside or outside diameters? Should I use regular clamps or those band clamps I've heard mentioned before on this site?
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Sawz-all (reciprocating saw)
I liked the band clamps I got for the 5" system. I tightened the regular u-bolt clamps as much as i could with my impact and it still leaked a little bit.
brandon.
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I liked the band clamps I got for the 5" system. I tightened the regular u-bolt clamps as much as i could with my impact and it still leaked a little bit.
brandon.
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