You should gain both, with the P3 I would go with the 25P fury, it can turn a 26 but will be at very low rpms in the summertime. I have the 25 on my P4 and have been happy with it. I tested the 26 during the winter and while my speed was faster i was about 300 rpms low, and knew there was no way i could turn that 26 during the summer months down here in lower Alabama.
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