Do Blowoff valves all have the same fittings?
 

Well, I realized they are not the same, but instead I was wondering, do Tial and SBD Blowoff valves use the same flange? If so would this work http://www.frsport.com/Flange-Adapte...FQetaQodNVQHDA to use the HKS blowoff on the SBD kit? I just do not like the set spring. Also I am not a fan of eBay, but they have the valve "new" for $125. The seller has good reviews too http://www.ebay.com/itm/NEW-HKS-UNIV...9dsyOg&vxp=mtr

Turbo smart race port bov works as well. Any 50mm bov should work. I would be worried about that HKS bov being a replica.