Originally Posted by Neil F.
The pipe diameter for that small amount is not going to have any affect on the sound. The muffler is responsible for that.
Well it did and does. If you know anything about the "mega phone effect," the difference in radiating sound is noticeable comparatively. And read " comparatively" as, unless you place one of those annoying devices on the end of your system to purposely sound like that, we normally go the opposite direction i.e. large (from collector) to smaller. Yes, the muffler has an affect, so does the converter, so does the design of the header, so, the question was answered based on my install of the "banks" exhaust system using the larger diameter system. I went back to OEM size pipping, which reduced the mega phone sound. Is it bad or good? Performance wise, didn't notice, sound wise, for me it sucked using the larger diameter.