catalytic convertors...

[PanthaVS]

Hey all...

I've read about people using "factory/standard" cats to make a twin system on their VR/VS commodores. Which I aim to do, BUT...

As far as I'm aware the factory cat on a VR/VS commodore is a 2-in 1-out setup, not 1-in 1-out.

anyone know what cat's they are reffering to?

Ideally, Bolt On as described here:
Best Mufflers - Twin cat setup

[Trikky]

factory cat on a VS is single in single out, you have a y pipe from the exhaust manifolds that the cat is welded to

[Not_An_Abba_Fan]

The VT has the two engine pipes welded to the front of the cat, the VS has the two pipes coming together just in front of the cat and a single pipe in.

The VR has a totally different engine pipe cat set up but two VR cats can be used as well. They are the same from VN-VR V6 and V8.