keep the sensor...O2 eliminator is a POS and jacks your gas mileage and gives zero perf. gains whatsoever.

 

Agreed. You should be fine.

 

They responded that it should have the bung. So, everything is not as bad as I thought.

Thanks everybody

 

that's definitively the o2 sensor

 

My bike runs great with the O2 sensor and my aftermarket exhaust. I had thought about getting a PCIII for the F4i but it runs so much better now with just and aftermarket pipe that I won't bother to get the PCIII.

 

Going to pick it up today, finally.
One more question - do I need to take off the fairing to install slip-on? I hope no.[&:]

 

just the right side...to get more clearance and easier to work with...it's just a few bolts!

 

i would suggest taking it off, it's not hard to do.

 

Installed itand even didn't break much,makes me proud of myselflol

Went for a ride - wow it makeslike all difference in the world. When you cruising at a constant speed, doesn't matter 25 in the city or 80 on a highway - you don't hear it (wind noise is louder) and it doesn't annoy you at all. But when you start accelerating it's like waking up the monster - deep and loud roar,it was making me smile like an idiot When it is idle you also can hear that it is not stock.Everything works just like I wanted,riding is now10 times more joy, Iwill never come back to stock exhaust.

Ihaven't triedother slipons, so I can't saythat this is the best one ever, but you can't go wrong with Akrapovic for sure - deep, not annoying sound. Loud when you want it, silent when you want it.

Thanks everybody for help!

 

well...actually...akra IS the best...muahahhha....
akra, sato, moriwaki...