
PET is predominantly used to make food packaging and I'm sure you've seen what happens to that when you get it hot or expose it to the elements for any period of time.
I don't recommend it for a number of reasons:
Firstly it offers next to zero heat resistance - the wiring will go brittle after a fairly short period of time (2-3 years at a guess?) and then you will start to have problems with it.To cope with the sustained heat I will need to use a fairly thick adhesive lined heatshrink (normal heatshrink will crumble after a few months) to seal the ends of the braided sleeving which will make the connector ends almost rigid, defeating the purpose of the flex boots and again you will run into problems with the wiring going brittle. Thirdly the braided sleeving is abrasive so a bunch if it corralled together will shorten the life of it even further.
Using the right spec sleeving it should last 20 years like the OEM 20vt coil looms - it is far more expensive than PET sleeving but OEMs use it for a reason.



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