Originally Posted by justinnum1
did you do the mod to keep the flap open? did you notice a difference after doing it?
Yes I did the mod before I even bolted up the exhaust. I cant say what kind of difference it made because I never had the exhaust on the car while the valve was operationa. However I can say that I did the valve mod on my stock exhaust and it made it a little deeper. Not much but you will tell a slight difference.
Here check out my DIY.