I tend to be direct as to avoid bullshit.

Okay I will be the first to tell you and after that I will leave you alone.
You do not come off as "Being Direct", you come off as an a**hole, and a troll sh*t.
And as you can see both in this thread and your previous body kit thread, you instigate far more "Bullshit" by making these wildly stupid remarks in your posts. Just know that next time you go crying wolf to the mods, because people respond to your posts in a certain manner. You instigated those people to post like that.
Hope I don't receive infractions for referring back to that body kit thread.
---------- Post added at 11:16 PM ---------- Previous post was at 11:08 PM ----------
On the actual topic at hand, here is what I did for my exhaust vid:
http://www.youtube.com/watch?v=F2SOsb14DCo
Just a sony action cam, mounted onto the back of my car with a series of acceleration vids, now my exhaust is not as complicated as yours with the butterfly valve and such, so you will have a few more clips to show.
The nature with these types of videos, is that there are way too many factors affecting the noise that it is never going to sound like the real deal. It comes down to: microphone, camera compression, editing compression, online compression, and the end users speaker setup (which in most cases are shitty laptop speakers or headphones).
So even if you took a studio mic and recorded a high fidelity track, you could still end up with footage that sounds nothing like the real deal.
The other thing is, you just recently installed your exhaust, I can't imagine you already drove the 1000km's to break it in fully. Until that point the sound will be still changing.
With all that said, I am also planning on redoing a good vid of my exhaust, my plan is to again use my action cam, with suction cup mount on the back/side of the vehicle. Then, since my action cam has a 3.5mm mic input, I can hook up my DSLR's Rode Shotgun mic, and mount that on another suction cup and place that in a similar position to my previous vid.