| And that is NOT true. If the exhaust is too big, it loses force and can swirl, etc which leads to slowing the exhaust stream. You want the perfect diameter. Big enough to flow without restriction at max output without being too big to allow the introduction of turbulence. What good is a huge X pipe if it flows more gas than the pipes that come before it? That is like saying adding a 10" x 10" pipe before your intercoolers will help you flow more air into your system. It still can't flow more than the lowest part of your system. It will also introduce a huge amount of turbulence into the air stream. Many people on here have made way more power with dual 2.5" exhaust than Shawn300zTT GT28R MD is putting down with his dual 3". Apparently the dual 2.5" system flows just fine for our cars. I would bet a months pay that if he slapped on a 2.5" Labree, he would see zero loss in HP. As I said, bigger does not equal better. Perfect flow is prefect flow no matter what size perfect flow happens to be. Going bigger than that will not help you and could actually hurt you. I am not trying to bag on Shawn at all. My exhaust is a dual 2.5" which is bigger than I need as well. I would also be willing to bet if I went to a 2.25" system I would see zero loss as well. Back to my original statement....bigger does not always mean better.
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