The MagnaFlow Performance Muffler - Universal - Stainless Steel - Satin Finish, part # MF12286, has a total length of 30" while the main body has a length of 24".
We don't use a rating scale for loudness, but I can tell you that this muffler is designed with noise in mind. It has the MagnaFlow sound, which is a smooth, deep tone. It's insulated with tightly packed layers of stainless steel mesh and acoustic fiber to regulate the noise. view full answer...
The 3 inch inlet/outlet diameter on the MagnaFlow Y-Pipe # MF10798 is the outer diameter. Since this is a custom installation I recommend having a muffler shop perform the installation unless you have experience with exhaust systems. view full answer...