sound generator, or "sound tube" is that plastic contraption from side of intake, with resonator in mid, and passing to cabin for more noise inside w/o extra loudness outside.
If better or not with or without it, simplest to test with it plugged off or unplugged in cabin, as it is subjective thing (eg. with stock exhaust i prefer it still operating, as subjectively car/engine seems duller/more lifeless (even if i know it's placebo impression and engine operates 100% same)). For "free plug" for test purposes one can reuse plug of 2nd cig lighter port in glovebox. If one likes better it plugged off, one can consider of doing sound-tube delete, for very slight weight saving and some cleanup of underbonnet space, by plugging off where sound tube connects to intake and where it goes in cabin.