I have a 2 into 1 pipe, and a 2 into 1 intake. It seemed a little ridiculous to me that I would give up 1.2 hp at 9k rpm, to gain .3 hp at 7,500 rpm. Its not bottom end at all, its midrange power. Like Dyno Dave said, he checked a big bore motor and a small bore motor on the crank dyno. It was worth it on the big bore, and it was not worth it on the small bore motor. You know, until you could look at the run time, hp, and torque curves on a dyno sheet when that was tested, I wouldn't go praising the reed spacers.