You're right no need to remove them the pipes came out straight out of the studs, I thought the studs needed removal too lol. I'm having a hard time trying to remove the 02 sensor connector that's clipped onto a wire on the side of the transmission as the location of the 02 sensors on the new JBA mid pipes are further down the pipe. So what I'm trying to do is remove the 02 sensor from the tie wrap its clipped onto but apparently I'll have to cut that plastic tie wrap it's clipped on and get new tie wraps and locate again. Does it not just slide out from the tie wrap? Because there's like a tab beneath the 02 sensor. I don't know. Plus the jba pipe isn't sliding into the OEM pipe, it just about slides in but not all of it. I'm thinking of taking either the mid pipe to taper the ends or expand the ends of the OEM pipe where the mid pipe slides into. Which one?