They work well with the 300, but don't expect anything much with the 250, other than a probably loss of bottom-end. You may get a little over-rev, if you motor and expansion chambers are tuned to make use of it.
For the cost, you will more than likely be disappointed. They give a great induction bark though, which is fine until you get to a track day with stricter noise control!
One day* I will fit my PJ38s to the MC16F3, but only for the noise! It would almost certainly run better on the F3 carbs.
*In the very dim and distant future, if I ever even start to build it! _________________ Andy.
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