Being a false statement or not depends on what you are considering, as theDreamer mentioned. Most exhausts that add significant performance are heavier than the stock exhaust, basically due to the stainless steel used in their manufacturing, and partly to their design. So, given Stillen's choice of material, acquisition cost, and mainly their performance gain and sound note, that is competitive.
If weight is a major priority, full-titanium exhausts are available, some with good sound quality, but their price is on a different scale.
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