I'm afraid that i'm going to screw up my BBK, and I don't feel like blowing $200 on that.
So, has anybody else done this? I know it needs to be installed between 10 and 2 oclock on the exhaust pipe to avoid condensation build up. I was thinking of putting it on the green dot on the below picture, because by the blue dot the exhaust isn't as wide, I don't know if the o2 sensor protruding into the exhaust path at that point is going to screw up the flow.
![Image](http://img41.imageshack.us/img41/2364/pglongdio.jpg)
I heard that it was possible for the exhaust to suck in air from the tailpipe? Is that true? I wanted to avoid the end of the exhaust pipe for this reason. Even the innovate motorsports install documents say that on single cylinder engines the oscillations of the exhaust gas are so large that a lot of outside air enters the exhaust from the exhaust tip....?
![Image](http://www.mopedarmy.com/mediawiki/images/5/52/Arbeitsweise_Zweitakt.gif)