DIY Exhaust Mod – Gain of 10+ HP!!!

[EssexPorsche]

Guys,
I'm sure it sounds different, possibly better than stock. But i don't see that you are bypassing any chambers at all.
I think the flow of the arrows is wrong on that picture.
Starting on the left (red arrow) the gasses enter here. They collect and equalize in the second chamber (when counting from left to right). When the pressure is sufficient, they progress - still from left to right - to the fifth chamber on the far right.
The final journey is from the collection chamber on the far right round the curved pipe and out.
Yes, there is some over-spill equalization in the center chamber but its not the primary route as gases in there eventually get pushed back to the left or right.
So why would you want to drill a hole in the pipe which is actually helping the exhaust gasses out (i.e.) the curved pipe. Surely doing this hinders the flow of the gas by allowing it to escape into the center chamber and hence hinder the expulsion.
Well.....that's how i see it anyway. ha ha. But if you like the sound....fair enough.