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Running a 2G mas is not going to cause the car to run erratically. That was and is still an upgrade for 1G mas folks looking to not overrun the 1G mas. Myself and countless other members un the community have run a 2G mass air flow sensor to no ill effect.
I run a 2G MAF as well but my chip is setup for this modification, just like DSMLink/ECMLink users would do. Or the workaround with "matching" 510 or 560 CC injectors with it. If you want fuel trims and such to be at factory thresholds, then I would assume a 2G MAF should be installed with a compensation factor. These cars run badly enough with the slightest of problems, I only suggest this for the reason of bone stock drive ability and ease of repair. If he keeps the motor stock, and overrun becomes an issue, he will be looking for a way to tune and upgrade.
I only suggest all this for ease of use and explanation upon the need for repair - like an shop unfamiliar with his car should it come to it. 2G MAF will be an upgrade in many ways as biglady stated.
I imagine 2G MAFs are easier to come by now that the price ceiling has fallen out on them, and with more link tuning options too. I remember when I paid $125 CDN for mine. Sigh. I picked up a pair from out part finding member here, as spares, and they came in around a tenth of what I paid for one. Haha.