Yeah, the audm headers, cat and exhaust system are all different lengths to the jdm ones, just to make it easy lol

So jdm headers will not simply bolt on to audm cat and exhaust (whether vtir or type r) as the jdm headers won't reach the cat.

Even if you go and change to jdm headers and jdm cat it still will not fit, as now the cat will not reach the exhaust.

So in short, jdm headers and cat are shorter, jdm exhaust is longer to accommodate for this.

So it's all audm or all jdm, so your best option is to look at headers made to audm specifications.

It is unnecessarily complicated I know lol

Best advice so far was when Moiz told you to get an injen cai first those things make a seriously huge aural difference, with a small power/torque gain to boot