I'd say go either for the Forge or the Pipercross one.
- both are open intakes which should satisfy your sound needs. A closed intake will simply not do that.
- both have good installation instructions and fit well.
- both come with a 4" airpipe (so in terms of performance gains they should be similar)
- you do not need to remap the ECU with either of them (although it may make sense to do it at some point)
- there are plenty of YouTube videos to hear and see them, although the videos do not do the sound justice, I recommend hearing them in person if you have someone nearby.
- The Forge has the bigger filter, you can buy it here:
Induction Kit for Hyundai i30N and Veloster N | FMINDK28 | Forge Motorsport
- The Pipercross one will be released as an official Hyundai accessory at least here in Germany, so full warranty support. The Hyundai-branded one will be available here:
Hyundai N-Performance Intake Kit, i30N (hyundaizubehoer.de) The Pipercross-branded version is available here:
Pipercross Car Induction Kit PK424 – The Pipercross Shop