Advice about non turbo headers and intake

[Shinniesftw]

Hi I bought an 05 is300,  I have a nice note out of the cat back I installed.  But I would like to buy these 5 to 1 headers from the US for 170 AUD. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F332738594033

From videos I've watched, the heat generated can melt your stock intake,  possibly melt the fuel rail directly above them and possible cause a carpet fire if I don't try and repurpos some bits of shielding.  Any advIce would be much appreciated.

And yes I will be getting a retune after the header install

[ilv1004s]

if you buy any us made headers you will have to slightly modify the area where the steering colum sits and relocate the O2 area as it hits the sterring knuckle