thanks for your input as you can see there is not a lot of space for "extra tips". Here are two picts of the central diffuser "keel" muffler cover in dry carbon.
side
rear
This will be added too going towards the side...as you can see there is now a huge gulf where all the exhaust parts went. This will allow us to get the roof of the tunnels as high as possible(= greater effect)adjacent to the keel.
this will balance the front splitter
without resorting to drag inducing wings and canards yet. (still looking working on HP options).
also a functional harness attachment point adds 0.5 lbs to the car and has over 18,000 lbs in deflection resistance(not yield just movement) amazing what a large diameter thin wall tube can do.