I have looked at many concourse cars and wondered if the exhaust is suppose to TUCK" up into the transmission crossmeber?
Well...the new, clear Martha and the Vandellas video clearly shows on this C-code car, at 1:14, that the Y pipe is at least 1/2 way into the arched sections of the xmsn crossmember.
That tells me that the aftermarket H and Y pipes are too tall. I'm having mine Jett-Hotted hotted so I'm going to shorten the diagonal sections by cutting out about 2" , rewelding, and grinding smooth. Then ceramic coatng.