Welcome to the forum.
You can try the Leovince Granturismo, which looks awesome and very aggressive while keeping an elegant style. The sound is nothing to write home about, I've heard it in real life, not very bassy, which in my taste is a must for exhaust. Here's a picture:

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Or the Leovince Corsa, which cost a lot less than the Granturismo, it's a hanging exhaust, full system so it may shake a little. I used to have a hanging exhaust, the shaking alone drove me crazy and pushed me to sell it, hanging exhaust never again. The leovince Corsa has a lot more bass, which is great but the sound level (dB) is much more compared to the Granturismo, if it's not a hassle then it's a great value/price ratio product.

- exhaust-leovince-gp-corsa-carbon-for-honda-pcx-125-2013-and-after.jpg (31.95 KiB) Viewed 6004 times
This is my personal favorite, the IXIL dual exhaust for the PCX. Gives you 4 options to choose from:
1/ 2 silencers installed, still has bass but a very low key profile
2/ silencer on top installed, bottom removed, more bass, but still low key profile
3/ silencer on top removed, bottom installed, even more bass, no more low key
4/ both silencers removed, the bass is insane, standing next to it can cause your heart to pump a little like standing next to a high power speaker. About the sound level, the police's gonna notice

.
Plus it looks awesome.

- pot-echapement-ix...-pcx-150-3b2ebc7.jpg (159.81 KiB) Viewed 6004 times
That's a Youtube link of the 4th option, no silencer whatsoever. That's a real life video, that's me filming my friend's PCX 125 esp.
https://youtu.be/L1MpSQDvjtk
Hope it helps.