Any difference between factory 4 and ti-4?

Any difference between factory 4 and ti-4 other than the looks?

iv ridden bikes with both and the ti-4 seems to be way better my freind has a crf450 with the factory 4 and didnt seem to do much but change the sound but his head pipes pinched pretty bad also and i got the ti-4 on my yz450f and it is deffinatly noticable but i sitll have to rejet the carb im loving the ti-4 so far no im just trying to get the dang titanium PC headpipe to

the ti-4 i know you can change end caps not sure bout the fmf

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