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The true-dual exhaust system that comes with the GTO is no slouch by any means, as the General put hours of R and D into it. Note that what appears to be a crossover pipe is actually just a structural solid member; no gases pass through it. Though this crossover-less setup helps to make a burbly, old-school sound, it will not yield optimum horsepower.
2004 Pontiac GTO - Back in Black

 The true-dual exhaust system that comes with the GTO is no slouch by any means, as the General put hours of R and D into it. Note that what appears to be a crossover pipe is actually just a structural solid member; no gases pass through it. Though this crossover-less setup helps to make a burbly, old-school sound, it will not yield optimum horsepower.  View Related Article

 

 

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