alright, well i'm selling my '05 tt-r125le since its too slow for me and ive grown out of it, alot. but i put a brand new pro circuit t-4 pipe onto it.
i still have the stock pipe and i really would like to keep the pro circuit and put it onto my z400.

so basically my question is, can i put a pro circuit t-4 from my tt-r125 onto my z400?

i would realllyy like to know, thanks in advanced.

 

I highly doubt it.
1) diamater and lengths will be off (it'll prolly have a lack of performance). These are critical aspects.
2) the mounts will be off.

 

Well your header is probably alot bigger on the z but if the pipe will slip on itll work youll prob have to make a mount (not very hard) and youll have to rejet thats for sure.