I also think its kind of funny that a lot of guys complaining about that de flange.... its a copy and not a modification of the copy . I havent read anywhere where they said they would install the hr/vhr flange . As far as making money well they are a bussiness to make money ... right now even with the inequal colleclor lenght that piss me of in a header design is I dont see anything that are or will be available for the low price Z1 are selling those. The cheated bent that can clearly be seen is another point but slightly less critical than the collector.
But overall they should/will perform better that any available shorty header ( stillen as exemple.... )
On a side note equal lenght primary tube does not alway mean they are true same lenght. There is up to a certain lenght that is relatively acceptable for primary ( 1+- inch) and should not be like 3 inch !!!
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