How much clearance needed for O2 sensor?

[David]

I'm about to weld on the O2 sensor ring. I'm going to have the sensor in the top of the exhaust about 5" from the turbo. I need to make sure I have enough room to get the sensor in. It looks like I have about 2-1/2" if I locate it straight up. I checked the sensor on my R1100S and it's about 3-1/2" long. Is this the norm? If so, I'll have to angle it back which will mean I probably won't have room to put a steel bumper under my fiberglass C2 bumper.

[dean]

I had to locate mine at 10:00 point to the rear. It wouldn't fit straight up.

Dean