I recently bought a siamese setup for my A10 from Draganfly, while it fitted well and looked good, within minutes of start up the short LH pipe chrome was blistering and blowing off in the breeze. The RH pipe is better although close inspection shows cracks in the chrome. Apparently all caused by the inappropriate use of copper in the plating process. I have advised Draganfly but being on the wrong side of the world a bit difficult to return...
Good news from Draganfly, they will replace the defective parts