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Ive been told by at least two local workshops a single 3'' setup is ok for 500 hp, with good headers and cats and a twin 3'' is like for 600 hp, I still think a twin 3'' is a overkill, The bigger pipes slow gas velocity down if you havent got a supercharger or big cam. Im not saying theres anything wrong with a twin 3'' on a stock cammed car as theres not, im just saying a smaller pipe may push the gas quicker creating more off the line torque. I guess i will soon find out.
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