[66gt350]

If your sister wants quiet, the advice I have for you is stay away from 2-chamber flowmaster. On the fastback, I've got the 351W, 2 1/2 pipes and the 2 chamber. And even idling in the garage the car is loud. My neighbors love me, especially when I leave for work early mornings.*G* One neigbor, across the street and two houses down, commented that they heard my car at idle in my garage, when they were in the back bedroom with all of the doors and windows closed. Now just imagine how loud it is out on the freeway at 3000 rpms and I stick my foot in it.

So, I'd suggest staying with 3-chamber. Nice low end rumble, but when you roll you foot into it, you can hear 'em just fine. /forums/images/icons/smile.gif

Rob
Member: Slightly Modified
66 coupe 302
66 fastback 351W