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Mike I had SW uncoated before switching to TPIS coated. I can say for a fact the SW were much hotter under the hood and even inside the car. I could really feel the heat especially on the center console. They are great headers and the fit is very good but if I were you I'd get a coating on them.
Mine are uncoated and I'd say the temps are about the same as stock. I'm not all modded out in the engine compartment though. I had most of the system wrapped from the cats back and removed it when I got frustrated with it when I was installing/removing the system frequently a while back and haven't noticed a difference inside the car.
From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
Mine are not coated and I love them. If I was concerned about underhood temps I'd contemplate wraping them. I'm not so bare they will stay, its turning into a road race car anyway.