I tried that golf-tee mod several weeks ago.
i am not too sure if there is any performance loss. I couldn't feel it.
But the car sure became louder. Personally, I had a modified sports car before, so I am kind of tired of the noise, so I reverted it back.
I am fine with the valves, but I really hate it when smoke comes out only on one side. People on the street think my other pipe is fake
If change to the OEM 50i tip, does it remove the valve as well? If so, will the car sound like after golf-tee mod?