Hey John.
You got two nice cars there. Does daddy let you drive the Shelby or is he keeping it stored for you till you get older?

You can't be both loud and legal. Especially in California. A flowmaster exhaust system has a great sound but I don't know how legal it is in Ca. Exhaust cutouts would give you the open header sound so you can impress your friends and still be quiet enough to drive. I think theyre illeagal in all 50 states so they can still get you in trouble.

Some cops like to make an example of kids in loud cars and might have it towed and leave you on foot.

It's called profiling and cops all deny that they do it. My nephew shaved his head and couldn't figure out why he was always getting pulled over. He didn't believe it was his skinhead. When he let his hair grow back the harassment stopped.

Go to a few car shows and ask the guys with big block engines what they have for exhaust and ask to hear it. Most of them won't mind firing it up for you.
AL