[MYTA21]

Hello Paul,
I am not an expert in the muffler field, so I may not be right in what I
say!
A resonator may go either before or after the main silencer, stopping some
noise or resonance in a particular pipe length.
As regards the dimensions, I am not sure as to what size the car was
originally fitted with, but for standard applications, I cannot think of a
pipe leaving the silencer being larger than the inlet, apart from the cases
where users want more noise!
Matters such as required back pressure are also a factor- but as I said I'm
not an expert.
I can think of lots of older cars where the outlet was a lot smaller than
inlets.
I'll try to go for little difference when I see the firm down this way.
Mike O