Can I drive a N/A Supra when im only on red P’s?

Can I drive a Non-Turbo 1994 Toyota Supra, when i only have red P’s?

Can I also install a blow-off Valve into a Non-Turbo Supra and is still legal red P’s? (say HKS SS blow off valve)

Also can I install a bigger exhaust and still be legal for red P’s? (say 4″ HKS Titanium exhaust).

Thanks~