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SNAFU
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It's probably the bubs but the wheel/tire package can also rob HP if the combination weighs more than the stock setup. You're measuring rear wheel hp using an inertial dyno. It measures the amount of energy needed to accelerate a known mass, the roller. If you add more mass to the package then the engine has to accelerate the wheel/tire combo in addition to the roller. It isn't going to give you an 18 hp loss, more likely 2 or 3 hp. The again, if you have forged wheels then the combination of the lighter wheel and the heavier tire should cancel out.

Put the SE's back on, remove the PCIII and take a baseline to see exactly how much power the 250 is robbing. That will tell you what the Bubs did. When you're dealing with unknown upgrades you need to change one thing at a time, but you knew that ;)

BTW, it's the Bubs, they're crap :yak:
 
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