Really good article. It's much more complicated than simply gutting an exhaust or putting on bigger pipes. Even with a super computer designed exhaust, the dynamics are so complex that only practical testing is what really counts. 
Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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