Quote:
Originally Posted by Siciliano15
with bolt-on mods they tend to work together to increase power. headers alone may get you 10hp and exhuast alone may get you 5 or 10 hp but when you do the entire system you can get 25-30 because it removes all of the bottlenecks in the system
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Its much more complicated than that and not necessarily true for all mods.
These are nice headers though, glws!