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Summit's had tons of returns on the Summit brand boxes.

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So true, all of the copy-cats products don`t seem to survive like MSD. I know some have had troubles but there`s a lemon in every product out there. Since I mounted my 6-series box under my dash, I`ve had zero problems.

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thats one of the biggest problems for ignition box failures in my opinion, guys mount em in the engine bay. I have mine under the dash, and even isolated by itself there it gets HOT...I can just imagine under the hood

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But if under hood it gets air flow, inside it
most likely doesnt get any air flow

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OEM mounts them under the hood on a lot of vehicles. Nontheless heat is not a good thing on electronics.