Maybe you can help me.
What is the difference between the cat of a 3.6 and that of a 4.2 litre? If the difference is only between the diameters, or if the cells are larger, the "large" engine is desensified.
Could you possibly extend the 3.6 cat tube to fit properly? Sure. You could. öhm
Question actually refers only to the cells.
V8 Mode greetings
Mark