I'M JUST ABOUT TO FIT A NEW MID Y-PIPE CATALYTIC CONVERTER ELIMINATOR TO MY ARROW EXHAUSTS BUT THERE IS NO HOLE IN IT FOR THE LAMBDA SENSOR, DOES THIS MATTER
Go on the Gsxr forum and ask people with the same set up what they have done and the implications. Myself i would get a fitting welded in as this checks your air fuel mixture which changes due to heat and weather and after market exhausts. That little sensor makes injection superior to carbs. Ring up arrow and see what they suggest,