I don't know if it was the long hours I put into the car this weekend or if I'm just dumb, but I couldn't seem to get the IE muffler and intermediate pipe attached. Do the pipes on the muffler need to be expanded to slip over the midpipe? I already have the midpipe installed on the car and holding the muffler up underneath looked like the pipes were the exact same diameter. I also noticed the muffler pipes are notched, which makes me think they're meant to have a tailpipe expander used on them.