Strange I can do this with just my Mountune exhaust it just took time to realise what the sound and RPM are. Now that said if you just want RPM sound maybe some modification to the symposer would be better for you so that the "loud" engine rumbling is only fed to you and therefore you are not that guy. Symposer is just an air drum being fed by boost pressure. Or maybe mount the cobb AP where you can see the tach graphically in your periphery.
Right - your exhaust makes it where you can hear (or feel) it and tell when to shift. If the radio is on or the windows down, it's hard to hear (or feel) the engine. And I have removed the foam insert from the symposer tube, it does make it more noticeable (a lot of people moan about the symposer, I personally like it - until I get something worked out with the exhaust, anyway). I can try the AP mount - I also have Torque Pro on my phone, so I can use a gauge that turns red or something at a certain RPM. But it's more fun to hear the exhaust!