A H pipe does not slow the exhaust down in any way. A X pipe may??????? to a small amount. But Depending On where it is installed on how it may effect the over all sound Or performance.
Just Like Headers If the Mufflers are placed to close to the Collector The Exhaust will be Louder
No matter what the muffler is. The further back the muffler is from the collector the Quiter the exhaust will sound,And you will not have a rappy sounding exhaust.
Headers allow the exhaust to flow more freely
full lenght Or shorties. Because it moves the collection point further away from the ports/
Or another way to look at it is, That IT's not bunching it all into One chamber. Even Tom Langdons duals Improve over all performance.Main reason is, it is seperating the exhaust into 3s and Not all into one small chamber/Manifold which in turn lets exhaust flow more freely.
Even some Headers were built as 12 into 1 Still improving the flow over a stock Resticting exhaust manifold. Bottom line here is Move The collection point further down away from the Ports
Or split The amount into two For a less resticting exhaust.
maybe to long winded here But Thats my 2cent imput in this matter.
God doesn't like ugly.
