FMF Powercore Silencer

Hey everything works great! I matched it with fmf gnarly gold series pipe and felt 20% or more power. I did change out the original pipe and can from1988, so I was expecting good power gains. The price should be about $80 bucks tho.

Put one of these on my 87 CR500 after the original internal baffle tube had broken off at the base of the can insert due to old age and neglect from previous owners. I restored it frame up some time ago, and now race open class on it, so rest assured I rode it hard before and continue to ride it hard weekly after this silencer replacement, and by that experience I believe I have a good basis for an informed comparison of the Powercore to the Procircuit factory works. Since there wasn't a lot of info on this pipe but it seemed to be one of the only options, I took my chances and bought one. So happy I did, sooner would have been better!

Keep in mind I am using the procircuit factory works expansion chamber, not the fmf gnarly pipe. This is just the silencer being replaced so there aren't any huge performance nets, just my observations on the subtle but discernible differences between the factory and fmf silencer, as an experienced rider with some time to kill.

It really gave the bike an extremely aggressive tone, even more so than the original factory works exhaust did at a couple db less, and the backpressure is just right, stock jetting tables do apply, but it likes about 1/8t more air to reach peak hp. My butt dyno wants to give it something like a 1.5hp increase across the board it flows so well. Spools slightly faster to peak and breathes better under sustained WOT conditions.

I attached a cobra sparky to the end of it to meet trail regulations, which was a bit tricky. The endcap appears to be pressed in but not welded in place, and there is a structural rail protruding along the top of the can about 3/8 tall which has to be ground off, but it cuts easily and came out well with minimal damage to the pipe after drilling and riveting the sparky around the outside edge of the tip insert to preserve the seal in the endcap. Pull through rubber computer case fan mounts will fill the holes nicely when sparky is removed for track riding.

I guess my only complaints, and the reason I gave 2/5 for ease of installation, (which are really just me being picky but still very satisfied) are these:

1. Extend depth of extruded end cap by 1/2 inch to facilitate rivet mounting of spark arrestors while maintaining edge strength and seal integrity.
2. Taper the structural rail on the top of the can down to flat, and give us an inch of flush for our add on spark arrestor if we don't want an integrated unit or can't get one for a particular machine. The deeper end cap will compensate.

You know we are mounting spark arrestors on these, and we know it's not your fault as the retailer for the design flaw, so I am not bashing motosport, they had it for cheapest and at my door as fast as it gets with some free stickers as well.

Lastly,

Opens easily and repacks in under 10 minutes. Great product, recommended for both restoration jobs and people who are extremely picky about performance.

looking for the best and sound quality this is it,would be even better for show if it was chrome...