today i went to the my friend that gave me the 599 for scanning two years ago because he have a GTO engine complete of headers, he was kindly to give me the headers because i want like to compare the external dimensions of the CAT with my CAT, now are to 3D scanning.
I will need to do a system for the RHD car and i have not the car, then if the envelope dimensions of my will be as those of GTO for sure can be install both LHD & RHD car.
Those GTO cats are very clos eto the engine, in the right side it touch the heat shield of the oil filter, and the rear external edges are a little bit polished, then i think was very close (or in touch) to the heat shields of the body.
The GTO headers are good manufactured, also if some pipes are crushed (by hydroforming) wiht the except of the connection to the CAT, this point have not a good design ...
In the last pictures my header installed on the engine.