I have run into boost blow off in the past with stock springs. On a B16a with stock valve train the boost and HP would fall off after 15 psi.Some good ol' skunk2s took care of it and went on to 22 psi with no issues.
I would like to see some "Real" tests with cam combos, I have picked up 30+ hp with ITRs over GSRs on a car in the 400whp range.
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