TBH, I don't think there's a product for a specific hair type. For instance many type 4 naturals like Shea Butter. I and several people on the forum cannot stand it; it makes our hair hard.
When I first joined the forum, majority of the people on the forum were relaxed. What I learned back then is they used the best of the products out there as far as my hair was concerned. I didn't ask them what their hair type was; I just read product raves and if something got raves (like Emergencee got in a recent thread), I made note of that. If they mentioned a good moisturizing shampoo, I found I liked it too. And when it came to conditioners, they were gurus. I learned about S Curl from someone who was relaxed; learned about AO GPB from relaxed folks. Learned about good lines like Giovanni, J/A/S/O/N from relaxed folks...all of whom had various types of hair, not just 4.
In other words, do not limit your options to just what type 4 folks use, coz you'll miss out on good stuff. Just do a search for Best Moisturizing Shampoos, Best Conditioners...and read the reviews to get an idea what you may want to try.
When I joined LHCF, I tried CON shampoo, Castille Soap, Shea Butter....because that's what people with my hair used. It didn't take me long to realize my hair type had nothing to do with the products that will work for it. Another thing to keep in mind as you read through threads is not every person who has your hair type will have hair you want to have, instead look at people whose hair you admire and find out what they use and if they like it and how long they've used it before you decide to jump off the cliff.
Here are some threads to start you off:
http://www.longhaircareforum.com/showthread.php?t=404916
http://www.longhaircareforum.com/showthread.php?t=322755
http://www.longhaircareforum.com/showthread.php?t=30482