Some good advice from Mr Tony, remember its a racer for the road the quicker you go the more compliant it becomes(never over the stated limit for the road in question though).
Em
Fixed that for you. How else would one see an indicated 160++mph in an Aero?
As Mr Tony says, and we're talking about the same car as I also owned it, maxed out at a correct 165 mph through the beam - different attempts using different manual and automatic changing patterns gave the same result. Likely to be an aerodynamic limit I think?
I also tried V-Max in my SuperSport, which according to the rolling road was giving more bhp than the AeroMax, but the SS would not do more than 155 mph - absolutely flat out. The first time I did this speed the car was extremely unstable under heavy braking, the end of the runway looks quite close.

MMC now have a CFD programme and whilst not as representative as the F1 Team's
programme, it does give some idea of what is happening aerodynamically with the different Aero model's.
The rear of the AeroMax falls away too quickly to the rear and the air does not stay attached, this creates a vortex and lift which is probably the limiting factor on top speed. In the case of the SS the culprit is the flat rear boot lid, which acts as a wing and again creates serious lift - this explains the lower by 10 mph top speed and the problem with the braking, the rear is partially flying and wants to overtake the front end.
I have not seen the CFD programme applied to the Series IV, but apparently the Aero 8 models do not perform aerodynamically as well as the AeroMax so the top speed is lower so it is very doubtful that the smaller BMW-engined (4.4L) cars will do 160 mph.
The new Series V has been designed using the CFD programme so possibly it may have the highest terminal speed of any Aero-chassised model so far.