There are a few things that can be done to quiet down an exhaust, and one of those is installing glass packs. Glass packs are designed to muffle the noise coming from the engine by absorbing some of the sound waves. They work by redirecting the exhaust gases through a series of baffles and chambers lined with fiberglass insulation. This absorbs some of the noise before it has a chance to escape into the atmosphere.
Glass packs are not going to completely eliminate all noise from your exhaust, but they can make a significant difference. If you're looking for even more sound reduction, you can install a second muffler downstream from the glass pack (or replace your existing muffler with one that's specifically designed for noise reduction). This will further muffle the engine noise so it's less noticeable when you're driving.
If you want to experiment with different types of mufflers and exhaust systems to find what sounds best on your car, there are plenty of options available. It's important to keep in mind that loudness isn't everything – there's also tone and pitch to consider. Some people prefer a deep, throaty sound while others prefer something that's higher-pitched and more aggressive sounding. Ultimately,