The FMF Fatty pipe gives you the best all around powerband. If you know about the stock pipe then the Fatty is a lot like this. It doesn't take any power off the bottom end, but enhances the top end and gives you quicker response when you open up the throttle. It is good all around because you can ride offroad and still do Motocross. This the most popular pipe out there right now. It all depends on what you prefer and what your riding terrain is.
fmf gold series FATTY
The horespower of 1988 yz 125 is 33hp or 35 with fmf fatty pipe
Ñø it olny works on 2 strokes unless you want to blow it up
the fmf power core 4 will give you the most bang for your buck
75mph
1994 YZ250 with an FMF fatty and it is FAST!
i have a 92 lt250r quadracer i am running a full fmf fatty exhaust and bored .80 over, i am running a 250 main jet 1 turn and a half out on air mixture screw third slot on needle
here's a good list of exhaust and silencers you can put on your rm80/85: FMF fatty, FMF SST, FMF Factory Fatty (copied version of Fatty), FMF Shorty silencer, FMF Powercore 2 silencer, FMF turbine core 2 (trail riding and neighborhood riding Pro Circuit Platinum, Pro Circuit Platinum 2, Pro Circuit 304 Shorty Silencer, Pro Circuit Spark Arrestor Silencer(neighborhood and trail riding), Pro Circuit 304 factory silencer
get a power pipe .... eg fmf pipe dep etc ...
I have an after market FMF pipe and silencer on mine.
i would recommend any fmf piping
no