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Back pressure can be good and can be bad depending on the setup and over all goals . On a small engine or mild engine , I say some back pressure is needed to maintain torque . On larger engines or more radically built engines , it becomes less of an issue .
There is also a big debate over using a X pipe vs. H pipe .vs no cross over pipe at all . I have always been a fan of the X design because it just seems to make more sense to me . Guys a lot smarter than me have told me that my car would run better with an H pipe over the X and even faster yet with just a simple extension off the header and a non chambered muffler . I still have my X pipe and MAC flowpaths on the car mainly because I like the way it sounds but I might do some changing around to pick up some ET .
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