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Anyone have any info about this process. Some time ago I saw some DIY info on hydroforming exhaust pipes and tubes. Can't seem to dig it up now. I did see a vid that some guy made an expansion pipe for his 2 stroke. Looked like he welded it all up and then hooked up a pressure washer to expand a metal.
Woundering what kind of presure and fittings could be used to accomplish this.
Woundering what kind of presure and fittings could be used to accomplish this.