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Remember the DP vs LMP2 battles in post merger IMSA? Dominated by the faster DP's most of the time because they could bury the P2's on a restart and on the straights.You have to kepp in consideration overall performance. While fast car on straight is 14 mph faster, it could very well suffer in the braking zones and corners, negating that advantage.
The aero numbers and parts required (changes to standard spec as listed):
A.M. 40/340 (added front split 140/340)
BMW 140/340
ZL1 100/350 (removed rear diffuser otherwise its 200/450)
Ford 80/300
650S 100/300
AMG 60/310 (small rear wing only) 60/360 big wing 60/260 big wing no diffuser
400Z 130/330
Cayman 80/340 (removed rear diffuser otherwise its 180/440)
Supra 140/340
The M4 and Supra have the same aero but the Supra is 11 mph faster at the top end and 5 mph in the 1000k run.
I borrowed the high speed GR4 BOP from the Spa daily sport race and cleaned it up slightly.
All of these cars will run within 2 mph of each other at the top end and 1-2 mph on a short (1000k) acceleration run. None of these are stock weight and all have power adders and/or restrictors. All cars are 200/300 aero
Vantage 8.96 P/W
M4 8.36
Corvette 9.16
GT Citroen 9.10
Viper 9.00
458 8.95
Mustang 8.78
NSX 8.87
Genesis 8.49
F-Type 8.73
RC-F 8.72
650S 8.45
SLS AMG 8.90
Cayman 8.91
Supra 8.99
Sort out those aero parts issues and let me know what your running and I will do some laps at a couple of different tracks.
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