Seriously bro, I haven't spent a single penny after swap, Alhamdulillah (other than getting the petrol pipe fixed to the tank (which leaked 2-3 days after the swap, if you remember). Mine is giving a very good average, even though the full CNG setup is still there (Venturi inside the MAF pipe, kit still connected.
The performance and average I'm getting is too good, so I'm not gonna mess with a single nut/bolt unless the engine decides to mess things up for me.
@OP:
You can check my thread about swap for pics to get an idea about the setup. I can post the relevant pics here as well.