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they are good as an insulator from the head, however the inlet sits on top of the engine and absorbs heat that way, so the gains would be very marginal
but they do withstand removal and refitting better than standard gaskets
imo not worth it unless you are boosted and producing a lot of heat from pressure
Well the main advantage of ptfe (other than not absorbing heat) is they don't get all bent and distorted when removing and refitting the inlets,
whereas the metal ones can leak a little when they get distorted, but they're not exactly expensive so it's personal choice really.
Glad you managed to get some on the second hand market, this place really comes in handy sometimes.
On their own i'm not so sure, but as a package of induction, matched inlets, decent exhaust and remap,
you will have optimised what the car has and definitely feel the difference.