Need advice on basic exhaust system

OH! If you’re looking for a dead stock sound or one with just a minor rumble, your muffler choice is the real dictator of sound.
A longer muffler will be quieter. Dynomax offers a line they call Sound FX. These could probably pass as stock HP mufflers. Under a low compression engine, they’ll probably pass as stock mufflers.

If you can’t get a long enough muffler body case under the car, use a glass pack before the muffler if you can OR at the straight length of tail pipe just before the exhaust tip. Again, the longer the glass pack, the more quite it will be.