Hey mate, sorry to necro an old thread, but I can't find the answers I need and I couldn't work out how to PM you.
I've got a 2004 VY berlina wagon with an LS1 and I'm looking at some proper engine work in the future, big cams, heads, etc.
I currently have 1 7/8' long tube 4 into 1 headers, into a 2.5 inch cat back exhaust. It came with cat deletes, but as someone mentioned in the thread linked above, the lengths didn't match up, so I bought high flow cats and had a shop add them to the delete pipes and lengthen them to make the flanges meet up.
What I want is to go to a 3 inch cat back system, but nearly all the info I can find says that the ute and wagon are the same design, but only the 2.5 inch will fit the wagon.
Does manta have a 3 inch cat back system that will fit my vehicle, and do I need a series 1 or series 2 system to fit the modified length cat pipes I have now?
sorry again for necroing, if you know how to PM I'd love to learn.
Cheers mate.