I wasn't at all impressed with the Janspeed manifolds. The first set they sent me were covered in weld spatter and the insides of the pipes were raggy as hell.
Janspeed claimed they had missed the quality control and were sending me another set. I marked mine before sending them back and would you know it 4 days later my "new" manifolds turned up with a mark in exactly the same place!
All they did was grind the first few joints that you could see to make them look a bit tidier
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