I thought that thread had his exhaust included in it- Sorry- I made all our pipes from used 250cc ATV/motorcycle exhaust- I cut the GY6 flange & pipe about an 1-1/2" from the engine and slid it in the larger diameter pipe from there, can't verify if it was a performance mod but it sure sounded and felt stronger. Also the ATV/motorcycle mufflers are better built!! I'd already added the Uni-filter and moved up a jet, the home-made exhaust just simply allowed the engine to flow/breath better.
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