10" exhaust rules out using an O2 sensor for sure. Tuning is at best a guess though without one,IMO.
Wonder if dyno shops have a strap on 02 sensor the mount to the ext tip? They have to have some way of working around that or atleast i would think so.
If you are talking Wichita Dyno then yes they have a tailpipe O2 sensor to put up the tailpipe as most tuner shops do. Will it be accurate with a short pipe? Not IMO. Damn sure will not be accurate if just at the tip. It needs to be as far up the exhaust as the sensor can be placed . FWIW,I would never consider running without a decent length pipe that can have a properly located O2 sensor unless running alpha n.
On a side note,I will not likely be using Wichita Dyno again after my last tune.
Chris is a nice guy and easy to deal with BUT, the tune was crap. I had to do it over to where I had it before I took it to him. IMO,a proper exhaust with an O2 sensor and logging in the real world is the best way.