In the video below I will be testing whether it is worth opening the exhaust valves on a BMW 550i with an n63 engine.
On BMW engines such as the N20, N54, N55 and many others people have been doing what is known as the GOLF Tee exhaust mod. That’s when you stick a golf tee into the vacuum line that goes to the exhaust valve. Unfortunately, on this and a few other cars, that would not work as the valve is CLOSE and NOT open by default. It only opens when the car is in high revs or high-power demand.
I wanted to experiment and see if keeping them open at all times would the exhaust note better. So, I used some metal zipties I had laying around and ziptied the valves open.
Let’s see if it made any difference and if it’s worth the trouble.
In my opinion, it gave slightly throatier sound on idle and around 3000 RPM. I would totally recommend it as a cheap and easy mod to make you exhaust sound just little better. Of course, this isn’t anything like installing proper sport exhaust, but something is better than nothing. I also wanted to mention that I drove the car for a few miles and no codes or other issues came up. Let me know what you think, could you hear a difference via the camera mic? Leave your comment below and don’t forget to like the video and subscribe to the channel.