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I found my old post about the twister muffler in 2004. Two of the twisters subtracted over 100HP at the 480 HP level
I need to check my notes/book to be certain, but I think the single twister subtracted 62 HP, not 50. I had an HX40 during these tests. It was in 2002-2003 time frame.
It was so quiet. Softer than a stock truck.
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