I have a question about the quad exhaust
Thank you

It's usually for cars that came with single-sided exhaust systems but people wanted to have the quad look. Most of the time, because the car didn't come with a cavity to house an extra muffler on the opposing side, aftermarket exhaust manufacturers will simply extend a pipe to the other side with a set of tips.
They do this because it provides a "functional" tip rather than a set of dummy tips. It's mainly just so you have a functioning set of quad tips.



