Quote Originally Posted by stndrd View Post
Every bend in an exhaust or intake system slows down air speed. The more you slow it down, the less efficient it becomes. By having a muffler that has 2 180 degree bends in it, this slows down the air too much causing it to become a bottle neck
Ok so just quickly going back to the post about the twinloop yielding less performance than the stock system, I could be wrong but I thought the stock muffler (DC2/EG/EK) had quite a few internal bends in it? Like, more than 2.

So I'm still trying to figure out how the 2.5" system with less bends in the muffler can produce less performance than the factory system.

Or is the factory muffler a different design to what I am thinking of?