So, I was working on an Alchemist Guide when I noticed this one.
The Vicious Claws rogue talent for catfolk requires that they have claws as a racial weapon, and bumps up the sneak attack damage with claws up to d8s instead of d6s. However, from what I can tell of the RAW, it doesn't require that only the racial claw attacks be used to gain the increased sneak attack damage.
In other words, could a Catfolk using the Fetal Mutagen (and presumably the Vivisectionist Archetype to keep the Sneak Attack damage scaling up) still get the increased sneak attack damage when using those claw attacks, or does it only apply to their racial claws?
On a related note, could you use the Vestigial Arm discovery and put the two claw attacks granted by Feral Mutagen onto those arms, while using the racial claws on your two original arms? Because an alchemist with four claw attacks that all roll d8s on for sneak attacks sounds ... pretty scary.
You could, however, use Monstrous Physique to change into a four-armed gargoyle and get its four claw attacks (plus a bite and gore - they'll still use d6es, but at that point who's counting?) It's from an adventure path so not every DM will be into the idea, but in general polymorph extracts seem like your best option for getting a lot of claw attacks.
I'll see your 4-armed freak of nature and up the ante to a SIX-armed nightmare. Just need a way to get it claw attacks...
Aspect of the Beast via ranger dip? Feral Mutagen will give 2.... That puts us at 4...
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We went through this ages ago BBT, and its very simple logic to show why you cant make attacks with those arms.
1. The discovery explicitly states you cannot attain extra attacks through it.
2. If you make more attacks than you could with your standard number of limbs you are making extra attacks.
3. You cannot take attacks with claws on vestigial arms while taking attacks with your actual arms (however you can switch between them on alternate rounds, during attacks of opportunity etc).
The primary use of vestigal arms is to allow you to use a 2hander and a shield, cast spells while holding 2 handed items, carry potions while using your hands to fight etc. Its still a highly useful discovery but its not a means to get 4 claw attacks.
If more people adopted a sensible interpretation of the rules we might still have vivisectionists in PFS but sadly it was not to be.
There was no ruling. Nothing is RAW simply because it's the way you like it.