The old lrp ai should work with an external LVC , but the new Ai has a built in Lvc !!! In any case if you run stock, and time your runs , a lvc is not really necessary !!! I run my old gtb 3.5r in my tc4 without a lvc, and I limit my runs to 6 minutes; I only burn 2200mah out of my lipo 40c packs.....