no, without o2 sensors once the car is in closed loop, it will run like complete ***. The o2 sensors are what the PCM uses to correct for target air/fuel ratio. If you don't get the extensions, you have to cut and splice your own, which isn't recommended to the limited experienced out there. And without extensions your sensors wont reach, at least on the passenger side for sure. And if they wont reach you can't hook them up, therefore having a car that runs rather badly.

 

I'm running w/o right now and mine's not running like complete a@$ maybe a little a$$.
-b