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Hi Guys, Need a little help understanding scavenging and the impact of changing pipe size through an exhaust setup. Is there a negative or positive impact to reducing exhaust pipe diameter after a header collector? Context: I have a stock 1977 280z with L28 and no modifications. I will be installing a new exhaust later this year. I have an MSA 6-1 which features a 2.5" collector and am planning on buying a Zstory muffer which also features a 2.5" inlet. I read on the forums that for an unmodified setup, the 2" or 2.25" setup is ideal for torque due to scavenging/velocity and that 2.5" may have a positive impact on high RPM HP, but at the expense of my wonderful low end torque. If I dropped down to a 2" or 2.25" pipe immediately after the header collector and ran that back to the muffler, would that provide the scavenging required to maintain torque for an unmodified engine? Or would that negatively impact exhaust velocity and therefore is a bad idea?
