TFI/Stealth HEI

[81CJ5]

So I've been reading about both of these upgrades and I put together a pdf of all the things I need and some key notes for myself and am wondering if the Stealth Hei is a worthy investment or not. Any other information you can give me is great.
Thanks, 81CJ5

https://docs.google.com/document/d/1UyiMIf6QSKmpxvptwfUTJmbuTi12JmNoIjRtOmTuwC0/pub