Possible but not practical if the muffler is a multi chamber type rather
than straight through.  What you need is a different muffler. Some cars have
just one rear muffer,  others have one or more small (about 20cm long)
straight through (sometimes chambered) resonators. You can start with a rear
muffler and add a resonator soon after the catalytic converted to adjust the
noise to something acceptable.

I bought a muffler for my Galant 4 cyl engine. WIth the silencer on, it is
too quiet, with the silencer off, it is kind of anoying when stepping on the
gas when taking off, after that, it is fine at idle speeds. I was thinking
about drilling a couple of holes in the silencer to the the tone level
inbetween, can this be possible?? Thanks for the advice.