for the cheapest relieble route i would go: 370's they're like $100 on ebay or here, SAFC-2 $250 or so and the stock MAF. I wouldn't push that setup to far but 7psi is a lot more fun than stock!! Why risk it and blow your motor, play it safe and be able to play another day.
and yes you can tune your setup without a dyno using a wideband o2
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