Seems like we could do with knowing how much useful downforce it creates versus the detrimental drag it creates? I suspect due to it’s mounting point the useful downforce is going to be limited, where as the drag is likely to be very real. So I reckon any very small gain you may have regarding cornering / grip is going to be lost with a lower speed around the whole track.
It would be good to see some back to back tests with and without the spoiler fitted.
Seems you’re the man to do it Mark.
Suppose it could look that way and I don’t mind giving it a go. But as we are probably talking seconds per lap, ideally we’d want someone with more accurate timing gear than me on my phone 
I wonder if a quarter mile drag would show up any significant difference? Just thinking thats one way of ensuring accurate timings?
I really don’t think any of us would be able to measure any difference!
You would have to be turning in consistent lap times to less than a second I reckon…
If we were talking about removing the ‘active’ aero package on the McLaren P1 with all the movable splitters, diffusers and spoilers that generates 600lb downforce… now that WOULD make a difference! 
Think you’re right Pete 
Or maybe a top speed run at Elvinton or similar?
I wonder if removing the stupidly placed exhaust from the middle of the diffuser would make any difference 
GT3 mod rocks mate!
I believe some testing in a wind tunnel has been done by reverie using the standard wing and then there wings