Just wanted to see what types of exhaust systems 400ex riders were using. I read about the big gun which sounds promising, also, anything under the 100 decibel mark is better for me since i ride on the East Coast.
I'm getting the new FMF Powercore4 squared silencer and Hi-Flo ceramic coated header soon. Should have the silencer this coming week. A friend has last years model Powercore 4 and it is loud! At least 98db . The new version is supposed to be more quiet and produce the same power gains, which are substantial with a 152 main jet and 40 pilot jet.
Impressive!! Just got that FMF Powercore4 squared and love it. Its a different bike all together. I raised the needle a notch also with the 152 main and 40 pilot jet changes. Also have a K$N filter. Stay tuned for more when I finally get my header, its supposed to ship on the 19th.