Cool Topic, Finally the instalation of the exhaust system on my truck was done...

Long tube headers with dual glasspacks 36", good sound on my exhaust system but In this topic I read Mufflers and Mufflers.... I have a question...

With all the restriction that is made with Flowmasters or Mufflers, Or Y pipe, X pipe, I dont know, Is not lost the basic Principle of the headers?, I mean, The basic pourpose of the exit of the combustion with minimal restriction and the increase of HP...

Well Its my question, thanks masters.