The ways to make a stock exhaust sound deeper include installing a cat-back system, installing a different exhaust tip, cutting the pipes and changing the muffler. Also, installing a chambered muffler offers a deep and rich sound from a stock exhaust.
Installing a cat-back system is a simple process, and changing the muffler is a common way to deepen the sound of the exhaust. Changing the muffler and tuning the sound using the exhaust resonator are both inexpensive ways to deepen sound. Cutting the pipes also allows the exhaust to produce a deeper sound, as this increases the size of the exhaust pipes.