Here's a Jalpa exhaust sound clip graciously provided by Mike from Lambo Chat. Although a low resolution recording, the overall tone does seem a bit lower and smoother from similar resolution Ferrari sound clips. Actually, it reminds me of a 3.2 with a Capristo Exhaust, the one exhaust (at least by sound clips) that tends to smooth out the Ferrari V-8 tone.
Although difficult to say precisely, the Magnaflow I have now is even a bit deeper than the Jalpa, and the Dynomax SuperTurbo Sport large-body crossflow I am looking at is deeper and smoother yet, much like a 365 GTC/4.
We'll see as I plan to mount the Dynomax next weekend. Will then choose between the Magnaflow, the Tubi and the Dynomax. The Dynomax and the tubi still allow me to mount a cat if I need to later, but the Magnaflow is clearly the least restrictive.
Learning a lot...