Touche my good man. Lol
The reason I'm unsure about measuring is im not sure if i could tell if the muffler would fit in the heat shield like the factory with The slight curves. The 300 is noticeably larger with electric sunroof and windows. The 240 is smaller and more rounder and muscle car looking, with no sunroof and manual windows. Both have vacuum only controlled trans with 1st gear and no passenger mirror.