yah, please let us know!!!!

actually it's pretty quiet. When cruising it has a deep tone that doesn't effect comfort at all. There is a little drone, but no where near other exhausts(invidia for one I've heard and this is ten times better in the drone department). Once you let her rip it sounds like an F1 car. Ofcourse if the noise is still to loud for some you can use a silencer(which i'm doing now) and it becomes almost stock like.
can't wait to see the numbers though :)

With no muffler and no resonator it will sound like ass.

There will be a buzzing sound that will vibrate in your skull at around 4000 rpms, in traffic it will make you nausea as it vibrates the fluid in your inner ear.

I would not recommend it.

I have been told by reputable sources (high hp engine builders for over ten years) that a straight piece of 3" OD pipe is large enough to flow 900 hp worth of exhaust gas. Add a few gentle bends and let's say it still flows good enough for 800 hp. You will need one HELL of an NA F20C to flow 500 hp let alone 8-900.

I hope your header collector is 3" otherwise you still have a bottle neck...

It's amazing the sound level difference between engines. My 5SFE has no muffler (just the factory cats) and is quieter than an S2k with the HKS catback.

so if my stock header has a 2.5 opening, I would need to get 2.5 test pipe with 2.5 inch piping for a custom exhaust correct? I would not be able to use 2.75 or 3 inch with my Apexi N1 muffler?