My buddy built my true duals today.
I'm running the stock manifolds w/ 2.5" piping into single chambers.
It sounds amazing! Incredibly tame at idle, yet doesn't sound stock. Makes me think of how long tubes sound with a conservative catback.
There is a bit of drone in second, but nothing like my old setup.
WOT makes me smile everytime.
Absolutely no rasp and it's very throaty compared to my old ory setup.
He spent about an hour and a half making it fit the way I wanted, it doesn't even hang as low as the factory y pipe.
My car is on stock springs and I have roughly 4-5" ground clearance at the lowest spot