Any Body Experienced with car's ?

I want to make my car's exhaust sound low and deepish
Most "boy racer" type have loud screechie exhaust's on their car's and quite frankly i think they are stupid.

I want a low tone kind of deep but nothing majorly out of the blue

am i kind of contradicting myself by saying the boy racer types are stupid and then making mine deep ?

if not how do i do it ?

Just like 5% - 10% deeper than a normal sound exhaust will do