I've never toyed with a non Z06 C5 I'm assuming the brakes are similar?
As far as rear brakes go on a C5 I'd bet that you can get away with covering up the wheels. I'd monitor the temps on the road course (if you track the car). I can pretty much promise you it would be ok on the street (much lower total use) + at the drag strip (single use).
If you want to get serious about it get some higher temp brake pads; I liked the Hawk HP+ and EBC green for cross street/ track . . . . that choice depends on what you do with the car. Better pads may be also be available by now . . . .
My data points are
1) factory 86.5-90mkiii (stock) Supra wheels nearly completely block off airflow and we don't get much in the way of brake problems until we get serious HP.
2) Rear brakes don't have a very hard job, the fronts do most of the work. You'd be amazed how huge of a difference there is between front and rear temps.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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