Superb mod, however there are some suggestions that you could look into before releasing the next update.
1. At about 610 hp, the top speed of the Bastion Coupe is at 354 km/h which is rather high, you should try to aim at about 340 km/h of top speed (drag limited) with 600 hp by increasing the drag coefficient slightly.
2. The torque curves are way too high RPM-biased for the 445 engines, especially for ones that equip with stage 2 blocks and on. Try to increase the lower end power and torque.
3. You can increase the max RPM of the higher performance ECUs, to even 7500 RPM is fine too.
Bastion Coupe 1.8
thanks to fillman86 for the idea i just remade it