50cc vs 125 vs 150cc exhaust

[br4inl3ss]

hi.
i have all the parts to completly rebuild my 139qmb and went 47mm 72cc.
i have the weirdo ( STOCK ) ugly two stroke looking exhaust.
i know it work, but looking to upgrade.
yes i want a performance upgrade, but its mostly to egt rid of this nosense two stroke ugly exhaust on a 4 stroke.
i have some cheap choice over there. ( around 100$ CAD with pipe, 70$ without, but all those with a pipe take 3 time longer to arrive ??... ) or i could go stock exhaust from a 125/150cc

but my question is: for stock exhaust, are the 50 125 and 150cc the same for flow ?

[90GTVert]

The 125/150 should be larger diameter all the way through. Tough to assume too much with Chinese bikes, but generally. Never tried to bolt a 125/150 pipe on a 50. Not sure that works (bolts up).

[br4inl3ss]

thanks. i dont care what bolt on. i just need the muffler itself

[sinfull]

Going to be mainly sound and angle of the headpipe, 150 have a larger fan and bigger bulge to clear, diameter of pipe is close on all pipes from 50 to 150cc, 1.25 diameter or less for some of the so called performance 150cc exhaust. Exhaust stud is close that 150cc pipes bolt to qmb139 without issues.

Only difference I have seen is the placement of the center stand, some have very shallow head pipes to ride above center stand mounted to the bike frame and some have deeper to snake around the center stand

Muffler are so varied and some are fake just for looks. Some small pipes just dump into large cans others have small pipes just run all the way through with a huge can around it for looks, look down the end and it is the same diameter all the way down.

Exhaust on the gy6 are really all over the map. Not like a 2t at all, pipes don't do anything really except sound different and usually weigh less than the stock muffler

[br4inl3ss]

thank you sinfull.

what i want is a better flowing exhaust, on the CHEAP.
i'm done with this stock weirdo exhaust and i'm pretty sure its going out anyway.
the pipe itself is in very good shape, and already habe my wideband sensor bung on it.
all i need is a dirt cheap muffler that i could fit on my pipe, and that is not as loud as those honda kids thinking going deaf make them faster. i jsut rebuilt the whole damn engine and bought some parts i needed for a long time to get it ready for the next season. so i'm broke. thats why i need a dirt cheap muffler.

now its too late he sold it to someone else ( because i didnt know if it would work ) but i could get a 20$ muffler that was on a 125 gy6 for 3 month, so almost brand new.