My C3 MUX has gotten to the point where it only accesses certain modules when it wants to. I have had it for quite a few years now and I think its just worn out. I need to get a new set I guess and I really only see the complete set, not just the MUX. So I will get a whole new set. I am debating on getting another C3 or going C4. Thoughts on that? I can't remember where I got mine last time but does anybody have any experience with any of the sellers on Aliexpress? That seems to be the cheapest place to find the. Also, if I go c4 will it work with my existing Xentry/SDS system I am using with my C3 or does it require a different version?