engine bay repair (dents)

hello all well time has come to redo my engine bay in my demon my issue is that some one at sometime toke a hammer to the inner fenders on my car i went and bought a weld on stud dent puller i hope it will be strong enough to pull them out i dont want to use the old way i know i will need two use some filler (bondo) etc it will be next to the exhaust how will it hold up to the heat in the engine bay thanks for the help
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