I was wondering if anyone on this forum knows anything about the lrd pro4 exhaust i know they are good on the z400 but i was wondering if they were really good on a 400ex, maybe even better than hmf, big gun, and yoshi.

 

ik on the z400s yoshi is top dog. buddy tried ALL the pipes offered and yoshi gave him most power gain.

 

obviously you dont know what your talking about considering that it has dyno tests of the lrd being better than the yoshi on ctracing.com