I wouldn't worry about heat soak much. The air moves through the intake so quickly that it doesn't have time to heat up.
I helped Little G install one on his '02 v6, and (IIRC) he picked up .2-.3 tenths and at least 1.5 mph in the 1/4 mile over the the factory intake location.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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