Quote:
Originally Posted by awy
at the rear underside of the car there's these big cavities, how much does sealing them up help with aero?
see e.g.
[can't post a link yet]
Should You Buy a Volvo XC90 Recharge? Thorough Review By A Mechanic
17:50
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Typically, a rear modification will not be done until all the upstream flow is as optimized as possible.
If you had a means of 'photographing' tufts under the car, that might inform your next move.