has anybody dyno\'ed the sidekick slip ons?

The Sidekick was dynoed on a Busa that makes 176 hp at the rearwheel with a Yosh exhaust.When the Sidekick was installed the bike lost 1 hp.
 
please elaborate....
were yosh slip ons replaced with sidekick slip ons? or.......

were the sidekick slip ons added to the yosh header pipe?

thanks,
 
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