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Exhaust Questions

1K views 2 replies 2 participants last post by  zipgun 
#1 ·
Tried searching and probably a stupid question but what the heck,

Does a nismo exhaust need a muffler replacement etc..after a certain amount of time? And if so what part is it? What kind of life span does an exhaust system like this have?

And does black soot on tail pipes,back of the Z, normal? and would getting headers etc.. make more soot?
 
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