I have not found it necessary to add a PowerCommander while running my Holeshots. There are others with aftermarket slip-ons who also run the same way. I would think that if one replaces the entire exhaust system, a PowerCommander-type modification will be necessary as the restrictions removed when eliminating the Catalytic Converters would likely result in a very lean condition.
Regardless of the system you are listening with, the sound quality will be limited by the microphone & recording system.
I found another sound clip today, so listen to this one:
Bounce's D&D sound test.
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MM2's Listing for Loudness:
1. Holeshot full system
2. Muzzy full system
Comment: Too close to call without a dbA meter
MM2's Listing for Sound Quality (My not-so-humble opinion & with no "base" for comparison):
Holeshot (stainless)-perfect (J/K! I bought them before BikeEffects started carrying slip-ons)
Staintunes (stainless)-deeper tone
LeoVince (stainless?)-a bit louder than Holeshots and a touch "raspy" (Bluestreek and Madmike side-by-side. Subjective 59 yr. old ears)
Blueflame-I
think they louder because the plug/restrictor can be removed. The link provided IS an FJR. Its jdog109socal's bike in Southern CA.
Comment: None of the slip-ons will mask or cover the engine noise. The "whine" will always be present. Riding on the highway with earplugs in, I only hear the exhaust. Without earplugs I can hear the engine "whirr" and the tires/pavement interface.
Conclusion: If you want the loudest in an attempt to overshadow any ambient engine mechanical noise, you should be shopping for a complete system.
Perhaps Geezer can comment on how much of the engine sound his system masks, but he already posted that the system was too loud for him. Fairlaner (Richard) is a knowledgeable and decent bloke, so you might PM his and ask his opinion about the Holeshot system,
vis-a-vis covering the engine sounds. (Just in case he hasn't seen this thread.) You might also ask the same question of Feejer/weejerman who now has a complete Holeshot system (The 1st one made and mounted?).
Is that more helpful?