yes and no. The stock VGT was designed in mind to have high drive pressures for exhaust brake functions and emissions control. With the VGT, expect 45+ psi drive pressure at max boost. With an aftermarket turbo, 1:1 is ideal but usually ratios of up to 1:1.2 are acceptable. The stock VGT can have ratios of 1:1.8+ :shock:Great question... also, what should the max drive pressure be? Lets say on a 12 with deletes and a mm... maybe arp 425 studs... And am I right to assume that if the drive pressure is higher than boost you are losing performance and efficiency?