[aerohead]

Originally Posted by Logic

Impact of a vehicle exhaust pipe position on the lift and drag coefficients: 2D and 3D simulations
https://www.sciencedirect.com/scienc...40X?via%3Dihub

Maybe i'm just tired or maybe something was lost in translation, but there seem to be contradictions in the text regarding lift and such..?

I'll check again when fully awake, but thought it prudent to leave this here for everyone to read as, it seems my guess elsewhere here was right:
There looks to be a worthwhile drag reduction to be had by placing the exhaust outlet in the middle of a car at speed's rear.

Don't forget that hot exhaust has 4x the volume of cool intake air before whipping out your doubting calculator.
I get 16 000 000 liters per minute for a 2L engine at 8000 rpm.

Vacuuming out the exhausts is also going to help economy.

Another link:
https://www.wrcwings.tech/2022/03/22...rc-rally1-car/

After you figure out how to drive without wheels on the car check back with us.