Here is some fun reading about our TT kit
http://www.camaro5.com/forums/showthread.php?t=105172
http://www.camaro5.com/forums/showthread.php?t=94520
http://www.camaro5.com/forums/showthread.php?t=91275
(R&D photo production version is slightly modified, and no that pipe does NOT hang below the subframe)
Auto Car
4" core!
If you have more questions please let me know.
Regards