Cheap & affordable way to make a 2011 ford focus base sound legally loud?

My dad owns a 2011 ford focus base, no fancy options of anything. He absolutley hates those guys with pretty loud cars. I have about a 50$ budget to turn his car into one of those as a prank. I'm not looking for answers where people say "drill hole in your exhaust", I'm looking for bolt on parts that will do the trick as I want to reverse it back to stock after he notices.

Save your $50. And roll the window up, and turn on the A/C, AHH! Feel that, Now that's awesome!