Opinions on the best ones for a gt30 set up?

 

If you're runnning a blow-through MAF or a Speed Density setup, I would go with Tial for both. If you're running a standard MAF setup, a Tial w/g and some other Recirc Valve such as a Greddy Type-S or an HKS w/ the recirc kit. This is simply because the Tial BOV is VTA only.

- Steve