Spooler whats your compression ratio? I have 10:1 and even with that 27psi spike I had no evidence of problems. That whole day of running hard at Wannagofast I was running 18psi and since Seb fixed my duty cycle on the boost solenoid I've had it at 21psi and hammered the crap out of it. Seb made a big deal on confirming L19s but I'm thinking the way the torque hits is going to play a big part along with compression making a difference. I also know Matt DiPaolo made his power at a ridiculous psi with the Stage 4 IPP block but a closed deck RJM block.
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