BTW, this is my plan.. (Graphic images courtesy of Dinan! http://www.dinancars.com/assets/File...st%20FINAL.pdf
MODIFIED with VALVE added (I photoshopped this to add the valves):
Is anyone versed in exhaust technology??!?! I am hoping this prevents drone by being after the Helmholtz chambers, but adds noise by being before the absorption chambers. I'll likely add turn down tubes after the valves. I hope there is enough room under there..