[vtirocz]

Regarding the crimped exhaust, these posts basically answer the question. It's crimped to allow a common exhaust between coupe and convertible models (which have extra bracing in that area -- see pictures in 2nd link below).

https://www.camaro6.com/forums/showp...35&postcount=2
https://www.camaro6.com/forums/showp...2&postcount=37

Also, this test proves (at least on an otherwise stock car) that the crimped section has no impact on the power curve compared to full tube in that section:

https://www.mishimoto.com/engineerin...he-crimp-myth/