Originally Posted by Area-52
My first posting on this forum, and I am new to the 1 series. My car is 2009 135 convertible with the N46 engine.
I have been reading through the posts and specially the DIY section. I will have some questions of my own later today.
Wanted post my observation regarding the "golf tee mod".
I watched the exhaust/muffler flap valve one morning and noticed that as soon as the cold/fast idle drops the valve opens automatically and says open my car and exhaust tone remains constant at low RPMs and has a deep tone.
Could the ECU programing be different for different model years?
I was asking the same thing, if you see my prior post history on the last page or two here. I ended up clamping the hose, and there is still a noticeable change. Give it a shot and see, it takes all of 5 seconds.