2011 pro with SPI pipe issues!

dingle

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Feb 14, 2011
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Fort Mcmurray
Hello, I have a 2011 pro rmk 800. I have installed Rk tek 14:1 head, Boyesen reeds, slp high flow intake. With stock pipe and 112 octane fuel at 600m elevation sled works great. At higher elevations I run 91 octane and sled works great. I recently purchased and installed a SPI y-pipe, pipe and a power commander v. With SPI map for low elevation the sled will drop off/bog/sputter if I try to use anymore than quarter throttle. Leaving the y pipe in place I reinstalled my stock pipe and the sled works fine.
Is this a lean or rich bog that needs tuning?? Pulled plugs and they look normal. Not real rich and not too lean. Has anyone else

Had issues like this with SPI pipe??? Any help would Be much appreciated!!
Thanks

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