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On my N/A I ran without the exhaust manifold heat shield for years and didn't notice any issues besides everything in the engine bay being really hot and the rubber lines on that side of the bay needed to be replaced every couple years. I'm sure it robbed me of some power and such but as far as damaging things other than the rubber lines (all 1 of them on my car + vacuum caps), not that I noticed.
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles
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