Ref the 1.60 header. I ran the Hatori header in a Focus - it broke after 36 flights. Bought my next headers from Karl Meuller. Many hundreds of flights later, no breaks whatsover, even when a tree stopped my free-flight-Focus. (Failed battery lead).

Have since run Karl's headers with 1.60's in Hydeouts, Temptations etc. All trouble free. I use the ES OS1.40 pipes (All three lengths). The pipe is so light and the header is so srong that I only support the pipe by the neck of the stinger, on a lord mount.