Not sure, there are very few options for SSDs that fit the 2013 MBA and they were rather expensive the last time I looked. 2013 was the year when Apple changed interfaces and started using some very fast SSDs in the MBA (although the 128gb model was much slower).
AFAIK, the 2017 MBA still has the same interface but I don't know if there are any third party devices that are faster than your original SSD. I was also reading that the very fast (2gb/sec) SSDs that Apple is putting in the new laptops are their own proprietary chips instead of Samsung, etc.
But really, what are you doing that requires a faster SSD? I have clocked my 2013 11" i7/8gb/512gb SSD at about 700MB/sec write and 720MB/sec read.