When I bought my KX125 it came with a "spare" pipe
A FMF Gold Series Fatty pipe with a FMF Shorty silencer
The pipe had a big crease/dent in the largest part of the expansion chamber
I found a place that will repair any pipe for $50.00 plus shipping Pacific Crest Pipe Repair. Owner: Bret Mitchell
http://www.piperepair.comI sent my pipe to them and had it back in 1 week and they did a great job.
I would recommend them to everyone who needs pipe work done
They also have 2 other sites for parts
http://www.mxDeals.comhttp://www.Faster-minis.com