11-02-2007, 10:14 PM #1
GPRXP Vigilante Waterbox and exhaust system
and ask for the conversion waterbox for a gpr with the rxp engine.
Part number is "MC1"
1821 S.W. 7th Ave.
You will also need the Riva 1300 free flow hose. Jerry sells it in his online store, or at any Riva outlet.
You will need to cut your J-pipe below the weld, and rotate the J-pipe. Make sure the lower water hose doesn't contact the SC.
Last edited by Hydrotoys; 06-25-2008 at 05:56 PM.
11-05-2007, 07:39 AM #2
Good question by RX951...
Why won't the stock rxp waterbox fit in the GPR?
12-22-2007, 10:19 AM #3
MC1 waterbox....feet not included.
Painted with aluminum primer and krylon textured paint.
What the system looks like installed in a GPRXP. Note, that the battery can go in three primary locations. As shown, over tunnel, or behind waterbox.
Overtemp sensor shown. Yamaha waterbox tie down shown. Suggest using a high quality clamp on top of waterbox, since hose seems a little loose.
12-22-2007, 11:15 AM #4
found the answer to my question
Last edited by JFizzleJR; 12-22-2007 at 11:20 AM.
12-22-2007, 11:20 AM #5
Yup. Just remember the Riva's and RR's are all much smaller holes. So you are going backwards to use those fittings.
12-22-2007, 11:23 AM #6
you mean going backwards in the exhaust restriction department, right?
I'm just looking for something as quiet as possible without losing performance. "stealth mode"
12-22-2007, 11:36 AM #7
Well, neither is that quiet. I've heard plenty of RXP's with the transom mount. The stock exhaust may be noisier..
Another option, is to go with the stock GPR exhaust and the plastic sound restriction box that comes with it. You should be able to squeeze the IC under it, and the battery behind the waterbox. You don't need the Riva hose, and usually can find the stock hose and plastic resonator on here.
12-22-2007, 01:45 PM #8
What about the stock gpr water box and SS? I think it would run near silent and backpressure should not be a problem because both engines are very similar in size, but the 4 stroke fires 1/2 as many times at a given rpm. A custom J pipe would be needed, but what is the point of the J shape anyway?
Mark, I know we discussed this, but figured I post to generate some ideas.
12-22-2007, 03:42 PM #9
Kill the jpipe. Re-do a pipe within a pipe similar to the J-pipe, and have it shoot back to the stock gpr waterbox. Of course you need to redo the front of the gpr waterbox as well.
The gpr waterbox is well made, and is very huge in comparison. I don't know if the interal backpressure is more or less. Consider sending one to danny, and see if he can flow it for you.
04-14-2008, 10:31 AM #10
I just got off the phone with them. They are running about 3 weeks out!
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