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It will be unchanged (price). They are $1150 shipped in the USA.

The RRP uses a proprietary 255lph pump as its primary internal pump. This is the only way its tested and promised to work. As for your 340, you can use that to fill the RRP or you can add it to the RRP as a secondary pump. If you use it as a secondary pump, it will need additional custom plumbing to integrate it, and a Hobbs switch to trigger it on in boost.

If you wish to replace the RRP 255 with the 340, you could try it, but its not tested or promised to perform that way. Its designed around the proprietary 255 primary pump and its unknown how well it will work without that exact pump as its primary pump. It might work just fine, or it might not... nobody knows.

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