Not exactly. The resonated muffler tips do not quiet them down much either. I had a junk one in the past. The resonated part filled with soot, dirt, etc, and that made it useless. They later rusted, and flaked out. Double useless.
You can't make a straight thru quieter unless its got one of those with silencer tips on them.. if it doesn't have that option there's no way in hell.. I tried to quiet mine down on my 89 GTS.. its not loud on the outside but inside the cabin is crazy loud. 2 resonators, no luck... one big HUGE resonator.. better luck but still not enough. :disappoin I'm just gonna buy a regular muffler for the car next time. for the 90 GTS I'm actually looking for either an OEM IS300 muffler OR an RSX Type S muffler.