Js04sILVerBullet

Well Im stumped... I just got done pulling a T5 out and putting a new one in, in a friends 95 GT and thier is bad exhaust leak coming from the passenger side area.

It still has the factory headers and has an o/r x-pipe...I have checked and checked again and where the x-pipe bolts onto the stock dome on the factory header is tight...but the leak still is there.

Could it be leaking where the o2 sensor is?

I realize this is hard to digenose on the computer but any suggestions would be appreciated.

thanks