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Actually, 1 rwhp is nothing. Every run on the dyno will vary a few rwhp. So, I doubt you gained any power from descreening it. Unless you ran 15-20 dyno runs with and without the screen, then average them out. Then compare both averages, and if you still have a difference of 1 rwhp between the two, then i guess it helped.
Also, descreening the MAF on 98's usually will cause problems. I've looked into this on CamaroZ28.com and almost everyone with a 98 A4, had PCM issues when the descreened the MAF. I would not recommend it. The stock MAF can handle up to about 450 hp, so just leave it alone till you make that much power. It saves stressing over PCM problems, invisible hp gains, and wasted money.
Don't get me wrong. I think the MAF is a good mod, just one that should be done after most other stuff.
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