Running em on my honda 450x now for a few races .. work great.. cant beat the price and if you bend a stocky it will cost 50-75 to fix and its still stock and weak.. they are thicker a little more volume and have a flat plate as opposed to the pressed thin guage siding making it hard to bend.. I am actually checking over the blueprints for the company to ensure they spot on.. one of mine actually were off a little bit possibly the fins were set in a little off or there was a slight twist from all the welding on these with all the mounts etc.. Still they come with a cap and ASI has a rep somewhere in Florida and also make car rad's and intercoolers. Their name is actually Auto sourcing international and sell in AU too. I would buy em even if they didnt support me. Laramie I am going to need your jetting for fcr 39 I think..finally tired of the BST dont go up and down now living in the high country.. and have been riding with em on the yz250f and the 450x so im comfortable with em now especially with an adjustable leak jet and mods on the spring and diaphram.. so now to find a used one!