I think our stock injectors are 19 lbs. I have a set of flowbenched FMS 24 lb. injectors, but I haven't installed them yet, but supposedly they are a good size. I think the Navigator injectors are 24 lbs. but you may want to ask about that.
Yeah, I haven't installed mine because I am not anywhere close to needing them at the moment. I am doing a ATI Procharger set up and wanted to have the injectors on hand for when I actually do put on the supercharger. On stock boost, it is advisable to run 24 lb. injectors, but if I go higher I have to get bigger ones. This is according to Dan.