I am replacing the muffler on my 07 lt. When I measure it it seems to be 36" in length. GM parts book says it is 20" in length. I bought a new muffler but from tip to tip is 18" what is the actual length of the muffler and all I have tip do is add an extra pipe to get the extra length for the smaller muffler?

 

yeah, pretty much add piping to make it long enough

I never measured, but 36 inches? that's 3 feet, your saying your stock muffler measured 3 ft? like almost half of the car ?

 

does your muffler look like this?

 

try this one.

 

Rice at its best right here.

 

From tip to the widest part of the muffler measured 35 7/8"

 

add extra pipping.