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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?
To duplicate a post I made earlier on the UK site, I’ve been having a bit of fun doing back to back tests and learning about making YouTube videos - my kids want their own Minecraft channels, so I’m trying to learn with my version, I call it Zcraft! 😄 Ever wondered what an exhaust system would sound like on your car with different mufflers? I personally found that the internet was full small clips but very little in the way of back to back comparisons on the same car. Well, purely for your benefit, I sacrificed myself!!!! I will splice parts of these together one day when I get more time, so that the same bit is played back to back on one video. 1. Thrush / Dynamax 17715 Turbo Muffler (I had some SERIOUS hay-fever that day so forgive my lifeless voice). 2. Zstory Classic Muffler (forgive the jibe at you left-hookers) [ 3. Zstory JDM Muffler (forgive my boyish squeaking) 4. Zstory Street Muffler (forgive the camera mount that broke halfway through the clip). Let me know what you think and I hope it's helpful / fun. (To be very clear, I have no affiliation with Zstory nor is this commercial in anyway - it's just me having a bit of fun and sharing it with fellow enthusiasts!)