I talked to the guy about cherry bombs and resonators and stuff, he basically said that there's nothing you could do to get it sounding deep, rich and throaty, it's just not possible with such a small engine. I asked him what would I need and he simply said "4 more cylinders".

When we addressed cherry bombs, he tried to change the topic and he said I don't want it cause it's just a cheap thing you would find at a "great" place like Auto Zone for performance parts

A resonator will just reduce the noise a dozen or so decibles, not much tone change though.\

The bottom line is that anything you do will just be a fart can like a Civic.