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You guys have offered lots of input on my original question of the advantages and disadvantages of 180 degree headers, thank you. Now I have a more specific question; a professional mechanic told me that 180 degree headers causes a marked decrease in low end torque. Yes you gain some horsepower at the top end but at the terrible expense of losing lots of horsepower and torque at low speeds. Furthermore, since most 180 headers exit where the A/C condensor is, usually the A/C condensor is relocated in front of the radiator, in effect blocking much air flow from the radiator resulting in significant overheating problems, especially for people driving their Panteras in hot areas like the southwest states. Anyone have any comments to verify or refute these claims? Thanks, David