Originally Posted by JLarson

Depends on your resonators/cats. With OEM cats and unresonated pipes, the FI was pretty drone free and fairly quiet. There was a little bit around 2200 rpms, but above and below that point, it was quite tame.

Once I upgraded to long tube headers, the drone got much worse (2200-2800 rpms), and I swapped in resonated 12" midpipes which tamed it back down again.

With 18" resonated mid pipes, even with long tube headers I think the system would actually be too quiet for me. But a lot depends on your tolerance for that particular sound frequency. You can always put down dynamat if it's too loud.