Damn Swen: Its just a top secret exhaust system ! I have been working with center rear exhaust sytems for the NTC3 for awhile now, everybody seems to just laugh about it! So yes its like the diff cases TOP SECRET! I will tell ya this, the cases are'nt RD LODGICS. I do alot of what you call top secret stuff to my cars, if it works sometimes I share , sometimes I don't. Why tell every little secret? I'm sure the factory guys tell us all they know.
Lighten up man, do some experimenting yourself!