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do we need a different WG spring or something like that ?
At least 1.4 bar w/ no boost control. Anything less then 1.2 bar, will not allow you to hit high boost pressures on race gas. If your looking hard at a T67, make sure you get it with the 8cm^2 housing. With the 10cm^2, you won't see 23 psi until 5000+RPM's. If you want the most power possible and lag is no issue, then go for the 10cm^2.