My first Stude Avanti, 63R3623, had factory ‘quiet’ exhaust, with small oval mufflers and resonators in place of the L&R pipes that normally connected the standard fiberglass mufflers to the rear tailpipes.
It also had the connector pipe that connected the two exhaust pipes….just ahead of the oval mufflers .
That ‘connector’ pipe really had no performance advantage… it was there to smooth out the exhaust pulses in the optional quiet Avanti exhaust system!