A question about Holleys

yellow rose said
This is the only heat shield I’ve used that actually worked. I won’t use anything else.

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Are these not for street cars?
WARNING
This product is not recommended for the use on:
1. Intakes with heat crossovers and EGR values in the intake.
2. Straight 4-6-8 cylinder motors where the exhaust and intake overlap.
3. Some castiron intakes have had an issue also
REASON: The polycore is an excellent insulation but it cannot take the extreme heat
that the exhaust creates. This causes it to get soft or melt.