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Has anybody use this cone that you install into the muffler?
 

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i'd like proof that it doesn't decrease HP, i've put a silencer in my STis exhaust and there was a VERY noticealbe difference in power... who knows, may be this one is designed differnently.
 

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The header collector would have to be designed to use them from the start. Have some to go into a harley Meg exhaust. but I needed the backpressure. They would only hurt the HEMI unless you were running open exhaust.
 
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