I like the soul exhaust tips on my base 718. They look great and much more cost effective than the OEM dual tips. Mine came with the single outlet.
Check this thread out:
https://www.718forum.com/forum/intake-exhaust/16002-new-x-pipe-tips-option-718-a.html
Check this thread out:
https://www.718forum.com/forum/intake-exhaust/16002-new-x-pipe-tips-option-718-a.html