There is a way to bypass the resonators but you have to have a rear exhaust outlet and rear hose off of a 951 equIpped XP to make the connversion I did a few of them years back.
It's not even a couple of hundred bucks, the pump is like $45 frorn Advance and the filters are like $20.00, the regulator is $29.95 shipped from quantum fuel systems
either the spring has come unhooked or you need a new spring, the spring can be replaced or put back on by removing the arm on the oil pump, no need to go farther than that.
I am going to give you a word advice, take it or leave it, pull the fuel pump and replace it and the filters, you are going to find there is nothing left of the fuel filters and they should be replaced every few years, no one ever does this and they all wonder why their skis don't run right.
I would be a lot more worried about the fuel pump, pressure regulator and injectors than the engine. more than likely you will be replacing the fuel pump and the regulator and cleaning the injectors or replacing them. Chance are quite good the fuel pump is now one big ball of rust.
ran across these on Ebay, I have never seen them before, I added it to the watch list and the next day they hit me with an offer, a little over 20 bucks shipped Seadoo GTI GS XP GTX SPX GSX Ocean Pro Flame Arrestor Air Filter Cleaner Adaptor | eBay
really not worried about the amount dumped into the resonators, probably the more the better , I have a Jetworks valve I can install there, I just want the pressure right so the regulator will function correctly.
So today I was looking for a place to put the water regulator, on a Seadoo this goes on the waterbox, this ski has resonators and it sure won't fit there so I have decided to mount it where the nipple come out the top of the exhaust manifold.
Normal water routing is a tee off of the cooling...