I would venture a guess that the Oakley "QuickSilver" header exhaust system makes no substantially measureable rwhp.
Just a guess??

Ranger

 

Juan, Im getting an Oakley system soon, and I compared it with the Quicksilver and realized theyre actually not the same. I thought they were too, but I was wrong!

 

Sent you Email Fabryce.

It looks like my GT3-RS (racing) headers I have are optimized for about 8200 rpm- higher than my cup motor comfortably spins.
The cargraphic ones I tested by but that didn't fit (thanks for that Alex) were 2" OD runners and a much more reasonable 6850 RPM. That sounds about right, or even lower RPM perhaps. So I think I'm looking for something like that- 2" OD down to maybe 48mm (~1 7/8") on the small side. Still looking for the right combo...

 

Anyone have any thoughts about these?
http://www.theracersgroup.com/shop/headers.php
996 cup headers. Not equal length, so you'd kinda figure they suck, but I've been told they actually flow pretty well? I guess the question is, how much better would I do if I for instance dropped 5k on a fully custom setup?