Best exhast for bottom end

I have a kx125 and i have a  fmf turbine core 2 silencer and i am looking for a pipe to put on it to add some bottom end power. What would be the best pipe.  

Pro circuit platinum, but I dont know if it will give you any significant gain in low end power. You tried a 1 tooth larger rear sprocket?  
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Stand in the place where you are, think about direction and wonder why you haven't
North Carolina

yeah, sprokets will make a bigger difference than any pipe.  
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Lancaster, PA
2007 CRF250R
4 Stroke 4 Life!

Yea i was thinking about changing the sprocket but it is new sprocket..ive had the bike about a month and the sprocket was put on 2 weeks before i got it so im going to wait to get a sprocket even though i know that makes the biggest different..i need to get a new pipe anyways because it cracked 2 weeks ago and i had it re-welded but im not sure how long that will hold up  

I'd say either PC Platinum or FMF Gnarly.  
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Lancaster, PA
2007 CRF250R
4 Stroke 4 Life!

We run an 05 kx125 and use 50 rear with either 12 or 13 on the front depending on the conditions on the day and the track.

We have a Fmf rev pipe on ours and the only other mod is a powerblade in the inlet tract.
We do not have much bottom end as a gnarly pipe would give,but the bike is jetted perfectly and with the pilot jet being spot on combined with the low gearing the bike just picks up and goes instantly.

 Remember if you add a pipe that gives more low down it will most likely rob some power from the top end.

It is hard to get a 125 to give good low down and top end in one overall package.

I would suggest you put a new piston ring in before choosing a new pipe as this may bring the bike back to life low down.

A carb spacer will also add to the bottom end