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Originally Posted by Bisimoto
Based on my experience with exhaust engineering and designs, the extra piping length post header/manifold will help slightly for "drone-prone" systems. More influence can come from the proper tuned length of the header manifold exiting the exhaust ports of the engine.
I may have found a system design that works well with the factory exhaust header manifold, but I am not done testing my prpototype to fully confirm this result. I will keep everyone posted.
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I am interested - assuming you can make something drone-free that does not alter the piping until after the last catalyst. Because of the restrictive rules that I compete under, we are not allowed to touch any exhaust parts before the last cat.