X plane doesn't have the greatest particles. They focused on other parts, I assume. I recommend you continue looking for better particles, and try and watch videos, go through forums, etc. I don't believe you can change the effects on a plane. The only thing you can change is their realism (cough cough) / graphics. This is done in graphics on settings. You might as well turn them really low because you don't seem to like them. This will also boost your performance.