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About 5hp sounds right with the dyno they posted. I think most dyno's are in incriments (sp?) of 5hp and it is only 1 grid higher then stock. That's rather unimpressive if you look at the $40 mod. Something to consider is if they didn't use the Cherry Bomb with the lid off it could be eating some power. As it stands that's an unimpressive test.

Actually after counting the grids I'm almost postive it is 5hp per line. That would show the dyno putting it just over 5.5-6hp more then stock. Roughly what stock with no baffle will get you.

There dyno shows it at just under 35hp stock and about 40hp with exhaust.
 

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its hard to believe any of the numbers these guys are claiming as most have no way to even tune for their pipe other than yosh.yosh and hmf numbers are probably most accurate as they have the right tools to dial them in.trinity has there programmer but it is a waste of time for any number gains compared to if they would have tapped into the race map.how they come up with 10hp is beyond me when others are getting beat by quads with stock systems with the same set-up trinity claimed a 10hp gain.a few other companies have come out with pipes and guys are getting better performance with the stock headpipes than the headers they offer.if it were me i would just go off feed back of peple that have the units.i have a yosh full system on mine and the gain over the stock with baffle out and lid off with crbm is still huge.alot more power everywhere.havnt heard from any hmf owners or any others really.one guy has a aeen and is happy but is getting better power with the stock header than their header.
 
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