I've done this exact thing on my corolla, Literally this EXACT thing....and it sounds really scratchy... because its a 4 cylinder, i immediately put it back because it sounded terrible....and you lose a lot of torque because there no back pressure from the muffler, think of it this way you take your car from blowing air threw a straw to blowing air threw a toilet paper role, you lose energy....significant loss of power,and you don't have a lot of power to begin with..this guy on the video is satisfied because he probably doesn't notice the loss because his engine is massive v8.