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Discussion Starter · #1 ·
So the D and D primary pipes for my Night rod are smaller at the head then step up a few inches out. Now that the Fat Cat system is on and TTS tuner installed and dyno tuned by Ryan at TMHD (He used to be on the v rod race team in Las Vegas), the damn thing falls on its face at about 8000rpm. I had Slip on mufflers with the stock pipes (large primary tubes) and it pulled clean through to the rev. limiter. Anyone else experiencing top end power loss with the D and D Fat Cat 2 to 1?
 
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