Thanks for all the comments.
the vents were on the car when I got it, so I didn't cut anything up.
The air pressure thing makes sense.
One thing the guards have dents in the wheelwells from the inside, from when the prev owner picked up some rocks when driving high speed 150 mph !!
And for those who asked,
Rims 18 x 8 and 20 x 10
Tires 225/40/18 and 345/25/20
I should have gone a wider rim, but I was told atthe time it was 10 inch wide or 15 inch wide !
so I stayed with 10's
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