What's the worse that can happen?

WWJD

Last week when I borrowed my M3 to my friend, (my car has lots of track stuff on it btw), he got pulled by a CHP and was asked to pop the hood. He saw a yellow towel on the top of the powersteering pump, he was almost wrote a ticket for modded engine whatever. My friend had to explain that the powersteering pump spells fluid bla bla bla.
I personally have never meet an *** cop light like, but you never know. If you like the sound, just keep the test pipes. If not, change them out, it's not worth of worrying.