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TBH the only parts of the exhaust system that give any change in performance are the manifolds and the cat. There is very little choice in terms of off the shelf manifolds - Janspeed and H&S are the only two that I'm aware of.
There is more choice for the cat. You also have the choice of sports cat and the so-called cat bypass.
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By how much do those who have gained by war fall short of the number of those who have perished in it? No doubt you will reply that there can be no comparison, that the dead cannot be numbered, while the living who have been rewarded may be summed up with three figures.
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