I have a tomei-catback with z1 3" stainless steel Y pipe, with cats.
The y pipe is the same width as the tomei Y but its not titanium so its a little deeper but pretty much the same sound.
You can cruise around town at 2-2.5krpm with no drone and its fairly quiet, at least to me it is. It only becomes obnoxious at around 4k+ rpms.
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