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
I have an after market FMF pipe and silencer on mine.
FMF Gnarly pipe and a Pro Circuit r304 silencer
It´s so fast, you can kill any 400. With mine, i´ve killed z400 and trx400
Wound out the stock KDX 220 R goes about 73-75. I ride a modified 220 it has the fmf gnarly woods pipe and turbine core 2 silencer, RB milled head, fmf reeds, uni
it depends on what kind of bike...if your talking about a dirt bike you can get a silencer pipe from fmf that is much cheaper than a whole exhaust that will make it much quieter.
bout 0.9km depends max speed maybe 1km cause your a crap rider probaly 0.9km
fmf
As far as I know you can only do this for the 250 models. However, there is a FMF Powercore muffler available for the CRF150F that is equally good or even better.
The out put is about 99 db, but if you want you can get the mega bomb header and the quiet core insert to lower it to about 94 db but that's about as quiet as it will get.
It stands for flying machine factory.
how cam you download a fmf cleance certificate