Challenger...?
If you have a Challenger, it's not a 1995, the first year the Challenger was made was 1996. So, I will assume it is a 96 model.
You say popping? You mean like backfiring? And only 50% power at full throttle.
You have an older boat. How much maintenance have you done on this boat? Have the RAVE's ever been cleaned? Has the carbs ever been cleaned? Have you checked and changed the inline fuel strainer. Also, sounds like the possibility that you may have some water in your tank.
Your description isn't to extensive. We need to know more about what's going on. How much you've done to it. How long it's been "popping"...etc...