Why would you bother buying overseas when you can support a local buisness .
GMC products are world class and made in Australia , i dont know what gauge steel Geoff uses but his pipes not only work well , fit well , look good, they are bloody strong . In the unlikley event your not happy , the manufacturer is local , speaks a form of English and is very happy to listen and will modify pipes to your requirements . You are buying direct from the factory ( well casa del Morris ) so no middleman clipping the ticket and bullshiting you that its the suppliers fault .
I have fitted GMC pipes to RM 125B , RM 250 B, RM 370B, YZ 125A , MX 125C, RM 400N and will soon get a couple of KX ones .
His YZ 125A pipe is without doubt the bigest performance mod you can fit to any YZ , MX, DT 125 / 175 twinshocker when coupled with a 34mm carb and if you want a GMC air box .