MARKY MARK

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?

MARKY MARK

Anybody?

dodgeram

if I remember right my stock exhuast was 3" before and after the muffler

joefarmer

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.

MARKY MARK

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?

MARKY MARK

Has anybody got any ideas on the best way to intall this muffler?

joefarmer

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.

MARKY MARK

Thanks joefarmer. Guess I'll have to find a 4" to 3" reducer with band clamps. Would a muffler shop be the only place to find this?