Thanks for the offer of assistance. I am going to hang on for stainless for now. I suppose a stainless Motad F4 system would be acceptable. I just wanted to keep my original silencer as there is nothing wrong with it. But I certainly am not sentimental about it. I agree with you to a large extent about the incremental gains. Sure, sometimes manufacturers make big changes (like Yamaha's crossplane engine) but generally these aren't all that common. However, a reason I would prefer an F4i system over F4 is due to the injection. I figure if they went to the trouble to alter it slightly there may be a reason. I could definitely be wrong but I dont have a way to measure the difference.

Mine doesn't have an O2 sensor or catalytic converter. Just a plain system.

 

well both silencers have a Yutaka 2334 stamp on them as well as other previous models so only someone who has dissected both knows, if there one human in this world who has done so - maybe the 2334 stands for client Honda, model 34