This might sound dumb, but does it matter which way the resonated pipe is installed? Should the o2 bung be towards the front of the car or the back?

The reason I'm asking is I will be installing a wideband and I'm not currently using that o2 bung. But currently the bung on the test pipe is facing towards the rear of the car and I want to flip it around to its closer to the turbo.

Thanks

 

I would have it facing towards the front of the car, but I would put the Wideband in the downpipe.