fmf, or procircuit?

[kdxmojave1]

I have a near new 1997 rm 125, and when i find it the right time for a new pipe, i either want to get the fatty moto, or the works procircuit. the procircuit is cheaper, and is less used by people, i dunno if thats a good thing. i also im wondering which shorty silencer is better (alreayd have spark arrestor). Either the 304 or the shorty from fmf? thank you in advance.

 

[john3_16]

Pipes rarely give gains...If they do it's usually pretty minor..I've seen exhausts actually cause bikes to lose power(although minor)..

I'd go with what's cheaper...

If you want an actual performance gain go with porting which can be cheaper than an aftermarket exhaust...Call Eric Gorr

 

[MX-727]

I may have agreed, but then I ran the FMF SST against the FMF Fatty Moto. Same day, same bike, same track. Huge difference. Here is the review:

FMF SST vs. Fatty Moto

You'll notice that Binky posted some dyno results that almost exactly match what I felt on the bike.