The 2M viper is my second turbine, the first with a tailpipe. I am not using bypass. My tailpipe was supplied with stainless tabs for mounting to the engine mount plywood.   What is the best way to afix the bellmouth to the front of the tailpipe?  I have heard it is difficult to cleanly and accurately drill stainless.  If I am reading the directions correctly, they recommend that the bellmouth be screwed to ply formers on the engine mounts, but they also say "glue bellmouth with silicone glue."   

Since it seems the stainless mounting tabs on the front of the tailpipe are quite substantial, they would fix the tailpipe itself in place.  If the bellmouth is fixed separately to ply formers with screws, is the bellmouth physically connected other than press fit to the tailpipe?  Does the bellmouth need to be sealed to the tailpipe, and is that what the directions are talking about, in terms of using silicone glue?  If so,  I am concerned about the high temperature in this area.  Will RTV high temperature silicone (the copper colored tube) be OK here?