Here comes few pictures on the topic
Best angle of attach was 0 degrees in cfd
3d printed air curtains in place in 3d model which is then rendered to look like car.
New rear spoiler
Rear fenderskirts+ rear air curtain.
, front tire deflectors, wheelcovers,front air curtains
More to come the diffusor and few other tweaks. The smooth covers are too dull looking so will put aluwheels with blocking plates to the model also.