[Jreyn1113]

Hey guys I'm wanting to put a new muffler on my 99 altima I'm just needing to know the outside diameter. Thanks

 

[Throckmorton]

Stop by or call any muffler shop for that information, or stop by any auto parts store and ask.

 

[amc49]

Often you need two numbers, the one end being a different size from the other, common.