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R-304 shorty vs 304 Factory

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Hey guys, need a little help here. I got a good deal on a PC pipe for my pals RM85 on Feebay... $119.00 brand new and shipped 👍

At any rate I'll be needing a silencer for it. The research I did for my 250 was that the factory silencer was a better suited for open MX tracks, and the shorty more suited for say tighter SX tracks? At least that's what I found with the search button. I'm guessing the same would be the case for an 85?

I am following the PC jetting chart as the stock jetting for both bikes is right on here at sea level.

Any input?

Thanks DD3

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I would go for the 304 Factory. We had a shorty on an 06 YZ250 and the power was close to the same, but it was for sure a lot louder around the track. Also we could not keep packing in it.

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85s are ported for all mid-top end power, running a shorty seems counterproductive.

BUT, when I rode CR85s I had a FMF Shorty and it was exactly the same size as the Powercore II silencer.... maybe the Pro Circuits are the same way. I run the 304 Factory on my RM250.

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