Increasing the MAF housing size will slow the air down, keeping the MAF within 5v. You'll need a 3" MAF housing to run more boost. When properly scaled, you can run up to the 450hp range on MAF. You'll need a speed density setup to go beyond that safely.
You should also go ahead and replace your MAP sensor, as the stock MAP is not good for boost. Omni sensors are plug and play once you update your sensor scaling. I run a 4 bar and haven't had any issues with it.
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